As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT PACK LIGHT ON IN CLIMB 12,000 FT TRIP RESET DID NOT WORK (EXT. LIGHT). LT PACK 24C, RT PACK 21C, LT PACK SWITCH TO OFF, CONTINUED FLIGHT AT FL 340. OK PRESSURIZATION CABIN, 7000 FT. ACFT GROUNDED. REPLACED THE LT PACK TRIM AIR MODULATING VALVE IAW AMM 21-61-20 PB 401. PERFORMED BITE TEST IAW AMM 21-61-00-700-806-002.