As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED TRIP OFF LT PACK IN FIRST HOUR, IN CRUISE 41,000 FT. RESET SUCCESSFUL FOLLOWED BY SECOND BLEED TRIP LT SIDE IN 20 MIN LATER. RESET SUCCESS 2ND TIME. ACFT GROUNDED. ON DEFERRAL, R & R 450 SENSOR, REF AMM 36-11-05 AND PRE COOLER CONTROL VALVE SENSOR REF AMM 36-12-03. OPS CK NORMAL ON ENGINE RUN REF AMM 36-11-00-710-801 FOR NR 1 ENG.