Any reason why the regen buttons quit lighting up when pushed? Bought it brand new in 2014,they lit up every time I pushed for the last ten years after loading hay I turned the tractor off and bout an hour later came back started the tractor pushed the auto regen button and it did not light up again. Check owners manual and it did not have any info on a regen fuse (thankin that’s what it could be). Anybody has any thoughts sure would be appreciated. Thanks.