As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK LIGHT ILLUMINATED AFTER T/O. RAN QRH, PACK LIGHT DID NOT RESET. CONT FLT & MONITOR PRESSURIZATION. AFTER 30 MIN PACK TEMP DECREASED AND PACK LIGHT EXTINGUISHED WITH MASTER CAUTION RECALL. WENT BACK TO NORMAL OPS. GROUNDED - YES. OPERATED RT PACK NUMEROUS TIME. UNABLE TO DUPLICATE PACK LIGHT FAULT. RT PACK OPS CK GOOD. REF B737-900 FIM 21-53 TASK 806.