What was found
LEFT PACK LIGHT ILLUMINATED IN CRUISE AT 350. RAN QRH PROCEDURE . LIGHT EXTINGUISHED AFTER SELECTING WARMER TEMP. LIGHT ILLUMINATED AGAIN ON RECALL AT TOP OF DESCENT AND EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE CHECK. NO FAULTS FOUND. PERFORMED FIM 21-53 TASK 813 NO DEFECTS NOTED, CHECKED WIRING ON LEFT PACK COMPRESSOR DISCHARGE OVERHEAT SWITCH (S2) NO DEFECTS NOTED. CHECKED LEFT PACK TURBINE INLET OVERHEAT SWITCH (S938) NO DEFECTS NOTED. CHECKED LEFT PACK DISCHARGE DUCT OVERHEAT SWITCH (S934) NO DEFECTS NOTED.