What was found
WITH CONTROL CABIN TEMP SELECTOR FULL WARM, FLIGHT DECK TEMP REMAINS COLD. GROUNDED - YES. PERFORMED PZTC BITE ON THE NR 1 AND NR 2 CONTROLLERS REF AMM 21-61-00-700-806-002. ON THE NR 1 CONTROLLER FOUND FLT DECK SELECTOR RED LIGHT ON BIT PORTION. PREVIOUS FLT AND VERIFY BOTH PASS WITH GREEN LIGHT. NO FAULTS FOUND ON THE NR 2 CONTROLLER. FOUND INTERMITTENT S2 REF WDM 21-61-12. REMOVED AND REPLACED P5-17 MODULE REF AMM 21-61-07/401 CONFIG 2. OPERATIONAL CHECK SATISFACTORY WITH LT PACK ONLY, RT PACK ONLY, AND BOTH LT AND RT PACKS. SUBSEQUENT PZTC BITE PASS REF AMM 21-61-00-700-806-002. ETOPS GROUND VERIFICATION SATISFACTORY.