What was found
UPON MASTER CAUTION RECALL, RH 'PACK' LIGHT IS ILLUMINATED. CLEARS WITH MASTER CAUTION RESET. GROUNDED - YES. BITE TESTED PACK ZONE CONTROLLER FOUND RT RAM AIR AIR SENSOR FAULT. CLEARED FAULT SUSPECT OVER TEMP PRESSURE FROM ASA LOG 60463839. REMOVED BOTH RH PRIMARY AND SECONDARY HEAT EXCHANGERS AND PLENUMS. REF B737-800 AMM 21-51-03-000-805-002. INSTALLED NEW PLENUMS ON PRIMARY AND SECONDARY HEAT EXCHANGERS. POSITIONED RH PRIMARY HEAT EXCHANGER ON AIRCRAFT AND HAND TIGHTENED MOUNT BOLTS. REF AMM 21-51-03-400-804-002. INSTALLED SECONDARY HEAT EXCHANGERS PLENUM COMPLETED GOOD REF AMM 21-51-03 COMPLETED FINAL TORQUE OF HARD WARE.