Instead, he took the service elevator to the main engineering floor.
Workshop One was empty.
The GT7 remained under the lights.
Yellow tape crossed the bay entrance.
AUTHORIZED ENGINEERING PERSONNEL ONLY.
Mason stood outside it.
For nearly a minute.
He could still leave.
He thought of Xavier Bell, Vortex’s twenty-four-year-old lead driver.
Mason had never met him properly.
He had watched Xavier during testing.
Smooth hands.
Patient throttle control.
The kind of driver who trusted equipment because trusting equipment was part of driving fast.
Mason knew the GT7 failure mode.
The car’s safety controls were catching it now.
But a degraded secondary seal could deteriorate in unpredictable ways.
Under the wrong combination of temperature, vibration, and sustained load, the fuel-pressure fluctuation could arrive too quickly for the electronic compensation to remain graceful.
Probably not catastrophic.
Probably.
Mason hated that word when applied to a driver.
He stepped across the yellow line.
His access badge opened the tool corridor because maintenance worked overnight.
The security system logged him.
He knew that.
He did not care.
He brought his standard kit.
Nothing specialized.
No hidden miracle device.
He started with observation.
The current engineering team had stripped and rebuilt the tertiary pressure assembly twice.
Both times according to the present manual.
That was the problem.
The present manual described the system after later revisions.
It did not describe the first GT7 architecture.
Mason had designed that architecture at twenty-one while sleeping four hours a night and believing exhaustion was proof of seriousness.
Richard Vance had challenged him constantly.
“Why three valves?”
“Because two create a dead zone.”
“Prove it.”
Mason proved it.
“Why that channel diameter?”
“Because thermal expansion changes response timing.”
“Prove it.”
He proved that too.
The secondary micro-seal ring had not existed in the original CAD model.
It was born during a track test.
At 2:13 one morning, pressure oscillation appeared only after repeated high-temperature cycles.
Mason took the assembly apart on a workbench and found microscopic bypass leakage at a mating surface.
He added a seal.
Temporary solution.
Then the temporary solution worked.
He wrote the specification by hand.
He intended to update the digital design Monday.
Emily called that Sunday.
Luna had kicked for the first time strongly enough that Emily could see movement.
Mason left early.
Monday became Tuesday.
Other work arrived.
Then the season began.
The seal remained.
The handwritten note remained in Mason’s original drawings.
The official digital file did not.
For years, technicians apparently replaced the component during rebuilds because some old physical parts kits still included it.
Then Vortex modernized inventory.
The old supplier disappeared.
A substitute seal was installed.
Similar dimensions.
Wrong compound.
Good enough for street temperature.
Not enough under sustained competition heat.
Mason knew before opening the housing.
Still, he verified everything.
He worked slowly.
The mistake of knowing a machine too well was trusting memory instead of evidence.
Mason had taught junior engineers that once.
He refused to violate his own rule now.
At 3:08 a.m. he isolated the assembly.
At 3:42 he measured pressure manually.
At 4:11 he removed the tertiary housing.
At 4:38 he found the seal.
Flattened.
Heat-hardened.
A faint fracture ran along one edge.
Mason held it beneath the work light.
“There you are.”
He felt no triumph.
Only sadness.
Eleven days.
Three senior engineers.
Two international consultants.
Millions of dollars of technology.
All of it stopped by a component smaller than Luna’s thumbnail because one line had vanished from a drawing ten years earlier.
Mason searched parts inventory.
No exact listing.
He expected that.
He cross-referenced an industrial high-temperature seal used in one of Vortex’s hydraulic test fixtures.