As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED IN FLIGHT AND EXTINGUISHED. ACFT GROUNDED. PERFORMED A PACK ZONE TEMERATURE CONTROL BITE TEST IAW AMM 21-61-00-700-806-002, FAULTED LEFT PACK TCV. REMOVED LEFT PACK TCV IAW AMM 21-51-10-000-801, AND INSTALLED IAW AMM 21-51-10-400-801. GROUND VERIFICATION TEST PERFORMED IAW AMM 21-51-10-860-006, AND AMM 21-61-00-700-806-002. ALL TESTS PASSED.