As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK AND ENGINE START THE LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL. LIGHT EXTINGUISHED WHEN MASTER CAUTION RESET. DUPLICATED LEFT PACK LIGHT ON RECALL. BITE TEST NR 1 CONTROLLER SHOWED NR 1 TCV. RESET FAULT. LEFT PACK OPS NORMAL REF MM 21 00 00. GROUND VERIFICATION SUCCESSFUL.