What was found
RIGHT PACK LIGHT ILLUMINATED DURING CLIMB-25000 MSL RAN CHECK LIST AND LIGHT RESET BUT REILLUMINATED NOT LONG AFTER A GOOD RESET. FINISHED CHECKLIST BY TURNING RT PACK OFF AND ISOLATION VALVE TO CLOSED. PRESSURIZATION AND TEMP CONTROL REMAINED GOOD ON L PACK FOR DURATION OF FLIGHT. GROUNDED - YES. PERFORMED FIM 21-53 TASK 802. AFTER PUSHING TRIP RESET RIGHT HAND PACK LIGHT EXTINGUISHED. OPERATED RIGHT HAND PACK FOR MORE THAN 90 MINUTES WITH AC 3 ZONE TEMP CONTROLS FULL COLD. RT PACK TEMP REMAINED STABLE. PERFORMED INSPECTION OF RT AC BAY. NO LEAKS OR DEFECTS NOTED. PERFORMED PACK TEMP CONTROL BITE PER AMM 21-51-00 NO FAULTS NOTED. REMOVED AND REPLACED RIGHT PACK TEMP CONTROL VALVE PRECAUTIONARY IAW AMM 21-51-10/401 OPS AND LEAK CHECK GOOD.