As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILLUMINATED ON PUSH BACK WILL NOT RESET OR CLEAR ON MASTER CAUTION RECALL. GROUNDED - YES. NO FAULTS LOGGED IN PACK ZONE TEMP CONTROLLERS. VERIFIED OPERATION OF R/H PACK INLET DOOR IN AIR MODE AND FLAP 1, NO DEFECTS FOUND. HIGH PITCH WHINING NOISE DURING R/H PACK OPERATION ON GROUND. REMOVED AND REPLACED RH PACK ACM REF B737-800 AMM 21-51-04.