As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF RT PACK ILLUMINATED. RAN QRH PACK LIGHT EXTINGUISHED FOR ABOUT 20 SECONDS THEN RE-ILLUMINATED. RT PACK INOP. GROUNDED - YES. ACCOMPLISHED INITIAL EVALUATION, OPERATED RT PACK, PACK LIGHT DID NOT ILLUMINATE. ACCOMPLISHED RT (2) PZTC BITE, NO FAULTS NOTED, REF FIM 21-53 TASK 818. REMOVED AND REPLACED THE RT PACK STANDBY TEMPERATURE CONTROL VALVE PER AMM 27-51-11-400-801. OPS AND LEAK CHECK GOOD. BITE CHECK OKAY. NO FAULTS NOTED. CLEARS MEL 21-1F.