What was found
(CAN) WHILE UNDER GOING A 300 HR, B-CHECK INSPECTION ON ACFT. MAINTENANCE WAS CONDUCTING AN INSPECTION OF THE RT SIDE WATER DROP SYS THE WATER PROBE HOUSING, PN 88336-3, WAS FOUND TO HAVE A CRACK IN THE UPPER INBD AFT CORNER JUST BELOW THE ATTACHMENT FLANGE AREA. A LIQUID PENATRANT NDT INSPECTION WAS CARRIED OUT TO CONFIRM THERE WAS A CRACK. THE HOUSING WAS REMOVED FROM SERVICE. TO BE REPLACED WITH A SERVICEABLE UNIT.