T 248 code is a speed senor at flywheel, and as for your tech rebuilding regulator, it will act up again,How much time did he take to rebuild regulator plus cost of rebuild kit. it may of just been cheaper to just replace it. we use the same regulater as we use on the clarks regulator, linde s are to high price and not a noticable difference in running. also to after any changes to fuel system , it is a good idea to hook up to laptop and hook up to pathfinder with engine cord and calibrate fuel.Flywheel could have a chipped tooth. T 235 has to do with direction. Hook up a lap top and calibrate pedal sensors