Was using a plasma cutter on my 763 G cab and when I was finished I found a problem with the traction lock. The BICS shows solid on the first three indicators but the 4th one (the traction lock) blinks, and beeps 3 times and won't disengage. The traction lock override is now useless too. I checked the fuses and relays and all were good. I also checked the traction lock solenoid with an ohm meter and it checked out good. Any ideas?