As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START ON MASTER CAUTION RECALL THE LT PACK LIGHT ILLUMINATED AND EXTINGUISHED DURING MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST. NR 2 CONTROLLER TEST PASSED NO FAULTS NOTED. NR 1 CONTROLLER SHOWED 1 FAULT TCV FAULT ON LAST PREV FLT ONLY ONE. ABLE TO RESET FAULT. RE-ACCOMPLISHED BITE CK ON NR 1 CONTROLLER TEST PASSED NO FAULTS NOTED REF AMM 21-61-00-700-806-002.