What was found
(CAN) AS REPORTED BY CREW OVER RADIO: SMOKE INDICATION FROM APU DETECTED, ALSO SMOKE DETECTED IN CABIN. ACFT WAS AT GATE AND PASSENGERS WERE ON BOARD. CREW FIRED BOTTLES AND REQUESTED CFR TO MEET AT GATE. PAX DISEMABARKED NORMALLY. MAINTENANCE ALSO ADVISED. CORPORATE COMMUNICATIONS WERE BRIEFED VIA EMAIL. FOUND APU DAMAGED AT FUEL NOZZLE. REQ NEW APU DEF IAW MEL49-10-01. APU REPLACED IAW AMM 49-11-11. LEAK CHECK C/OUT SERVICEABLE.