What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) N688T, Gulfstream ga-iv, being operated by twc aviation inc. as a usc 14 cft part 135 flight enroute from van nuys, CA, to montreal, quebec, diverted to North Platte, NE, due to a hydraulic low indication light. The passengers were transferred to another aircraft. Maintenance found the reservoir fluid low. Maintenance replenished the reservoir of N688TT, and the aircraft flew to lincoln, NE. Duncan aviation found that the hydraulic relief valve was malfunctioning allowing fluid to transfer to the other reservoir and then discharge overboard. Maintenance replaced the flight hydraulic system relief valve and the flight hydraulic system reservoir.
As the FAA filed it
(-23) N688T, GULFSTREAM GA-IV, BEING OPERATED BY TWC AVIATION INC. AS A USC 14 CFT PART 135 FLIGHT ENROUTE FROM VAN NUYS, CA, TO MONTREAL, QUEBEC, DIVERTED TO NORTH PLATTE, NE, DUE TO A HYDRAULIC LOW INDICATION LIGHT. THE PASSENGERS WERE TRANSFERRED TO ANOTHER AIRCRAFT. MAINTENANCE FOUND THE RESERVOIR FLUID LOW. MAINTENANCE REPLENISHED THE RESERVOIR OF N688TT, AND THE AIRCRAFT FLEW TO LINCOLN, NE. DUNCAN AVIATION FOUND THAT THE HYDRAULIC RELIEF VALVE WAS MALFUNCTIONING ALLOWING FLUID TO TRANSFER TO THE OTHER RESERVOIR AND THEN DISCHARGE OVERBOARD. MAINTENANCE REPLACED THE FLIGHT HYDRAULIC SYSTEM RELIEF VALVE AND THE FLIGHT HYDRAULIC SYSTEM RESERVOIR.