Intermittently getting this error. 200fpm car. Runs fine for days then craps out. The position encoder has been changed, the low speed and intermediate speed boards were swapped and adjusted for proper setting. Motion info shows only a couple of fpm deviation from target. U38 and U39 on the relay pilot board were swapped around. Relays on the ETS board and the board itself have been changed. Looking for some input on the possible culprit. The MSU is getting changed this afternoon.