What was found
ON DESCENT LEFT PACK LIGHT ON RECALL. EXTINGUISHED WITH MASTER CAUTION RESET. ON TAXI IN LEFT WING BODY OVERHEAT LIGHT FOLLOWED BY LEFT PACK LIGHT WOULD NOT RESET. ACFT GROUNDED. ACCOMPLISHED OVERHEAT DETECTION SYSTEM BITE TEST - SHOWED FAULT 24 - LEFT A/C BAY. CHECKED AND FOUND BROKEN CLAMP ON DISCHARGE DUCT ASSEMBLY. REMOVED AND REPLACED COUPLING ASSEMBLY. LEAK CHECK GOOD IAW AMM 21-51-01. RE-ACCOMPLISHED OVERHEAT SYSTEM OPS BITE TEST, TEST PASSED, NO FAULTS NOTED. OVERHEAT LIGHT OUT IAW AMM 26-18-00-710-005.