EQUIPMENT DESCRIPTION: ANTILOCK BRAKING SYSTEM (ABS) ELECTRONIC CONTROL UNITS (ECU) FOR OVER-THE-ROAD TRAILER APPLICATIONS. THE COVER SEAL (O-RING) MAY HAVE BEEN IMPROPERLY INSTALLED IN CERTAIN EASY-STOP TRAILER ABS ELECTRONIC CONTROL UNITS. AN INCORRECTLY INSTALLED SEAL COULD PERMIT WATER TO ENTER THE ECU CAUSING A FAULT TO DEVELOP. THIS WILL CAUSE THE VEHICLE’S TRAILER ABS WARNING LAMP TO ILLUMINATE IMMEDIATELY WHEN THE WATER CONTACTS THE BOARD, DEACTIVATING ALL OR PART OF THE ABS.