What was found
AFTER ENGINE START ON RECALL-CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED, AFTER MASTER CAUTION RESET ZONE TEMP LIGHT GOES OUT. GROUNDED-YES. PACK TEMP CONTROL BITE DONE FOR LT AND RT PACK. NO FAULTS ON LT PACK AND 2 FAULTS ON RT PACK, FAULTS 21-51267 (PACK TCV) AND 21-5166 (LIMIT SWITCH) ACTIVE. B737-900 FIM 21-62 TASK 824 FOLLOWED: 3 C/B RESET PROCEDURE NO HELP. REMOVED AND REPLACED RT PACK TCV, REF B737-900 AMM 21-51-10. REPAIR CONFIRMATION COMPLETE AND BITE SHOWS NO FAULTS. LEAK CHECK GOOD. GROUND VERIFICATION SUCCESSFUL.