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 RIGHT PACK LIGHT ILLUMINATED, EXTINGUISHES ON RESET. GROUNDED - YES. REMOVED AND REPLACED RH PACK TEMP CONTROL VALVE REF B737-800 AMM 21-51-10-000/400-801. PERFORMED BITE OF #1 & #2 PACK ZONE TEMP CONTROLLERS, NO FAULTS. L/H & R/H PACK OPS NORMAL, NO R/H PACK LIGHT ILLUMINATED. NO FAULTS FOUND.