What was found
NR 1 BLEED HOT CAUTION MESSAGE ON APPROACH , AT 5,000 FEET. ABORTED APPROACH AND RETURNED TO DEPARTURE. LANDING UNEVENTFUL. INTERROGATED CDS AND FOUND FAULT CODES 7001- L BLD OVR TEMP AND 7005- L BLD AND OT, C/W FIM TASK 36-046, REMOVED AND REPLACED NR 1 BLEED OVERTEMP SWITCH IAW AMM TASKS 36-11-16-00-801 AND 36-11-16-400-801, PERFORMED OPS CHECK FOR AMM TASK 36-11-16-720-801. OPS CHECH GOOD, CAUTION EXTINGUISHED, NO FURTHER DEFECTS NOTED. RETURNED TO SERVICE.