As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT AT GATE LEFT PACK LIGHT ILLUMINATED. RAN QRH CHECKLIST AND PACK LIGHT EXTINGUISHED AFTER PRESSING TRIP RESET. PACK RESUMED NORMAL OPERATIONS. GROUNDED - YES. PERFORMED FIM 21-53 TASK 803 INTIAL EVAL PACK LIGHT RESET AND REMAINS OUT DETERMINED TO BE INTERMITTENT FAULT. OKAY FOR SERVICE.