What was found
AFTER PUSHBACK L PACK LIGHT ON RECALL. EXTINGUISHES WITH MASTER CAUTION RESET. GROUNDED - YES. DUE TO HISTORY OF "LEFT PACK LIGHT ON RECALL", REMOVED & REPLACED TCV-1 (V139) AS PRECAUTIONARY REF B737-900 AMM 21-51-10. FOUND TCV-1 FWD CLAMP WORN, REPLACED AS PRECAUTIONARY. ALSO, FOUND L/H TURBINE INLET OVERHEAT SWITCH & L/H COMPRESSOR DISCHARGE OVERHEAT SWITCH WIRING RUBBING AGAINST THE DUCT, RE-POSITIONED BOTH WIRES. ACCOMPLISHED L/H PACK/ZONE TEMP CONTROLLER BITE PER AMM 21-61-06-700-806-002, OPS CK NML.