What was found
(CAN) PILOT REPORTED LT BLEED AIR LEAK AFTER TAKEOFF. ELECTED TO SECURE LT ENG & RETURN FOR LANDING. DURING MX FACILITY VISUAL CHECK, THEY FOUND A BLEED LOOP CONTACTING MULTIPLE PLACES. LOOP MT 67, PN 04-31102-111A, WAS TOO CLOSE TO THE BLEED VLV & BLEED DUCT INSULATION IN VARIOUS SPOTS. THE LOOP WILL BE RE-POSITIONED TO THE CORRECT STAND OFF FROM BLEED LOOP TO DUCTING IAW MM CH 36. MX FACILITY PERFORMED A VISUAL CHECK, AN ENG RUN AT IDLE & LRU BLEED LOOP TEST WITH NO APPARENT FAULT SHOWING.