As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON APPROACH ABOUT 3500' ON RECALL. ACFT GROUNDED. PERFORMED PACK/ZONE TEMPRATURE CONTROLLER BITE TEST. NO FAULTS OR FAULT HISTORY LOGGED. RAN LT PACK. PACK OPERATES NORMALLY. DUE TO HISTORY, R & R NR 1 PACK/ZONE TEMPERATURE CONTROLLER. OPS CK GOOD REF AMM 21-61-20.