What was found
RIGHT PACK LIGHT ILLUMINATED IN CRUISE FLIGHT. EXTINGUISHED WHEN MASTER CAUTION WAS PRESSED. MASTER CAUTION RECALL WAS PRESSED FOR DESCENT CHECKLIST. GROUNDED - YES. VERIFIED THAT THE RIGHT PACK LIGHT IS ON IN THE FLIGHT DECK. PERFORMED THE PACK TEMPERATURE CONTROL BITE CHECK PER B737-800 FIM 21-53 TASK 821. THE R/H PACK/ZONE CONTROLLER INDICATES THAT THE RAM AIR ACTUATOR IS FAULTY. REMOVED AND REPLACED THE R/H RAM AIR ACTUATOR PER B737-800 AMM 21-51-21-400-801. OPS CHECK GOOD. ALSO ADJUSTED THE RAM AIR DOOR PER AMM 21-51-400-803. OPS CHECK GOOD. GROUND VERIFICATION GOOD PER FIM 21-53 TASK 821.