I have a 2007 JD 4720 with a rodent chewed proportioning valve wiring harness wire. I was able to pull the wiring harness out of a channel leading back to the proportional solenoids but there doesn't seem to be a way to get at the other end without splitting the front end. Has anyone else had to replace this harness and does it actually require going through the splitting process? If yes...is that something a backyard semi-mechanic can handle or do I need to involve the dealer? Obviously this leaves my tractor immobile so getting it to a dealer would be a pain not to mention the cost. If I have to go that route...how long should it take to do the split/repair? Thanks.