What was found
APU ON AT GATE, EXCESSIVE SMOKE OUT EXHAUST, FUEL PRESS REG LOW ON ECAM. APU OVERTEMP-AUTO SHUTDOWN. APU OFF, NO SMOKE OUT EXHAUST AFTER SHUTDOWN. NO SMOKE OR ODOR IN CABIN. APU SWITCH TO OFF, APU INLET DOOR VISUAL CHECKED CLOSED. REF: TSM 490000-810 & IAW TSK 921. R & R AS NEEDED & INCLUDED FINDINGS IN ACP W-U. REPLACED APU IAW AMM. OPS CHECKS GOOD NO LEAKS NOTED.