Not too "odd" if you look at what was going on. Maneuvering around the paddock the brakes would have been being applied very frequently. Same with backing. A soggy accumulator tank would give you the results you described. Further, if the engine was shut off, upon restarting, the system needs to see a bit of distance and speed on the wheel sensors to turn off the ABS and TC lights. Again, in the paddock, you would never go far enough or fast enough for the lights to go out. When the Eas failed to work, were any doors or the back window, tailgate open? Anything even ajar will stop it working. Was the rig parked at an odd angle? Maybe a sensor is going dodgy and the potentiometer in the sensor was on a "Bad bit" of it's travel. You should be able to check all the sensors when you find the cables for the FM. To test the accumulator, with engine running, simply press the brake firmly a few times in rapid succession. The lights should not come on. The pump should only be cycling on after several presses. If it comes on with one or 2 presses. Soggy accumulator.