What was found
AIR RETURN FOR SMOKE/FUMES IN THE COCKPIT. TROUBLESHOOTING COCKPIT SMOKE/ODOR IAW AMM 05-51-26-800-801-C1. NO SMOKE/ODOR DETECTED. LEFT PACK TRIP LIGHT COMES ON SHORTLY AFTER TURNING ON , UNABLE TO TRIP RESET. BURN ODOR COMING FROM LT PACK BAY. PERFORMED PACK TEMP CONTROL BITE CHK IAW FIM 21-62 TASK 801, FAULT CODES 21-51117 & 21-51123 APPEAR. REMOVED LT ACM, FOUND UNIT SEIZED, ALL WORK DONE IAW AMM 21-51-04-000-802-002. INSTALLED LT ACM, IAW AMM 21-51-94-400-802-002, LEAK & BITE CHK. PERFORMED, LT& R PACK/ZONE TEMP CONTROLLER BITE TEST, IAW AMM 21-61-00-740-801-002, TEST PASSED WITH NO FAULTS NOTED ON EITHER PACK, PERFORMED OPS & LEAK CHECK OF LT AIR CONDITIONING PACK, AND ACM, NO LEAKS NOTED, AIR CONDITIONING SYS IS FUNCTIONING NORMALLY.