1999 (23' - SeaCraft Ctr Console) Sunk at Dock

[Mudhen]

Anybody have any experience with a 99 23' Car Console sinking at the dock ? Mine went down today, there was a faulty pump with high water alarm that went off and drained the batteries. . . . . no clear path as to how the water got in the boat and swamped. No rain, through hull connections seem alright, the marina working on it is targeting the scuppers which sit partially in the waterline ? ?