What was found
FWD CAB ZONE TEMP ILLUMINATED ON RECALL, LIGHT EXTINGUISHED ON MASTER CAUTION SYSTEM RESET. GROUNDED - YES. NR 2 PACK ZONE TEMP CONT SHOWS "FWD CABIN ZONE" SENSOR FAULT DURING BITE TEST. SAME AS "HISTORY" FAULT CLEARS ON VERIFY. NR 1 D2TC - NO FAULTS. ON BITE REF AMM 21-61-00-700-806-002. BOTH PZTCS REMOVED & REPLACED TO ACCOMPLISH TSR701823. ACCOMPLISHED PZTC ON NR 1 (M1442) BITE TEST PASSES. REMOVED & REPLACED NR 2 PZTC, (M1443) REF AMM 21-61-20-400-801 REF FIM 21-62 TASK 801. ACCOMPLISHED PZTC BITE REF THE SAME. OPS CK GOOD. ACCOMPLISHED CABIN TEMP CONTROL & IND OPS TEST REF AMM 21-61-00-700-807-002. OPS CK GOOD. GROUND VERIFICATION SUCCESSFUL.