Are you still getting the leveling sensor fault or any others along with the dvr1 fault? As far as the leveling sensor issue, if you've already checked them and replaced the ipls board, check tape guides and the spacing of the LU LD sensors. There should be a page in the back of the manual or print that explains what this should be. Also don't crank down hard on the sensors when replacing, finger tight +1/4 turn or so.
We have a lot of motion 2000/4000s and this is the first I've seen this tech bulletin calling for cutting an MOV out of a board. interesting. for reference if anyone else needs the bulletin here it is
https://moen.nidec.com/elevators/-/...erence-152-HC-DVR-Field-Modification.pdfyou may need to bite the bullet and spend a few hours on hold with MCE tech support