As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT PACK INOPERATIVE, LIGHT ILLUM. EICAS MSG L PACK TEMP DISPLAYED. LIGHT DID NOT EXTIN WHEN STBY SELECTED AND RESET PUSHED. AIRCRAFT RETURNED. LT PACK TEMPERATURE CONTROL (PTC) BITE PROCEDURE WAS PERFORMED IAW FIM 21-51-00 FIG 103, COMPRESSOR OUTLET OVERHEAT SWITCH WAS REPLACED IAW AMM 21-51-19 AND LH PACK FLOW CARGO AIR CONDITIONING CONTROLLER (PFCAC) WAS RESET (M1610). TESTS WERE PERFORMED WITH SATISFACTORY RESULTS.