What was found
ON TAXI IN, WHEN APU MASTER SELECTED ON, ECAM DISPLAYED "APU EMERG SHUTDOWN" GROUNDED - YES. FOLLOWED TSM 49-00-81-810-803-A, FOUND WATER INGRESS IN PNL 108VU, CLEANED AND DRY ELECT CONNECTIONS. REINSTALLED ONL 108VU AND PERFORMED APU OPS CHECK REF AMM 49-00-00, CHECKS GOOD.