As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILUMINATED DURING TAXI OUT RESET WITH MASTER CAUTION. ACFT GROUNDED. SUPPLIED CONDITIONED AIR TO RT PACK AND RT PACK LIGHT DID NOT ILLUMINATE. OPS CHECK GOOD, REF FIM 21-53, TASK 804. THIS CLEARS MEL 21-32B. NO SPECIAL PROCEDURES. GROUND VERIFICATION ACCOMPLISHED.