As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB NR 2 PACK LT ILLUMINATED. RAN QRH AND PACK LT ILLUMINATED 20 SECOND AFTER TRIM RESET. GROUNDED - YES. PERFORMED BITE CHECK ON RH PACK TEMPERATURE CONTROL NO MAINTENANCE MESSAGE FOUND. REMOVED AND REPLACED TEMPERATURE CONTROL VALVE PER B737-800 AMM 21-51-10. BIT CHECK AND OPS CHECK GOOD. ORIG SUBMISSION DATE: 12/27/2022