What was found
(CAN) AFTER 2 GATE RETURNS, FLIGHT WENT AIRBORNE AND HAD FURTHER MAINTENANCE ISSUES, NO ICE PROTECTION. RETURNED TO STATION AND LANDED OVERWEIGHT BY APPROXIMATELY 20 TONS. PFR SHOW ENGINE NR 2 PYLON LEAK AIR SWITCHED OFF BMC NR 2 TEST SHOWS BLEED LEAK. AFTER RESET BMCNR 2 TEST PASSED. PYLON RT PANEL462 CR OPENED. LEAK CHECK C/OUT. ALL OK. ENGINE NR 2 IDLE RUN UP C/OUT. 10 MIN, ALL NORMAL. BMC NR 2 REPLACED AS REQUIRED. BITE TEST PASSED. BMC EXCHANGE WITH SRT/AC AMM 36-11-34-000-802-A.