As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF WHEN ENGINE AIR SELECTED ON, AN EXCESSIVE AMOUNT OF AIR VOLUME ENTERING FLIGHT DECK. NR 2 ENGINE AIR OFF, AIR FLOW RETURNED TO NORMAL. CREW ALSO REPORTED AN UNUSUAL HOT SMELL IN AIRCRAFT. FLIGHT RETURNED. NR 1 AIR CONDITIONING PACK AND APU 'Y' DUCT SEALS REPLACED. NIL FOUND.