What was found
RIGHT PACK LIGHT ILLUMINATED. WILL NOT RESET. GROUNDED - YES. REF AMM 21-61-00, ZONE TEMP CONT 2, ACCOMPLISHED PACK/ZONE TEMP CONT BITE TEST TWICE AND FAULTED THE PRIMARY TEMP CONT VALVE. ACCOMP GVI OF AIR COND BAY AND INSP HEAT EXCH FOR BLOCKAGE. ALL CKD GOOD. FAULT NO LONGER PRESENT. REMOVED AND REPLACED PACK TEMP SENSOR REF AMM 21-51-52-000-801. REMOVED AND REPLACED PRIMARY TEMPERATURE CONTROL VALVE PER AMM 21-51-10. INSTALLATION TESTS PASS. RAN BOTH PACKS FOR 10 MINUTES. OBSERVED NO FAULTS ON PZTC BITE/VERIFY TEST NOR ON M/C RECALL.