Update: Dropped machine off at Tazewell on Monday and picked up yesterday. They cleaned out the carb and to my surprise changed the oil, painted the old rock bucket I purchased from KentT, and washed the entire machine.
Overall, I couldn't be more pleased with the service I've received from PT.
Having said that, it was hard to hold back my disappointment when it started sputtering like before when Terry started it to load on trailer. He called the mechanic back to look at it and he said water must've gotten into solenoid for a coil when they washed it... said should go away as it warms up and evaporates. I ran it a little bit more and sure enough it started running better.
I haven't run it anymore since then so I guess the verdict is still out on whether it is fixed for good. I'll post a status update when I've had a chance to run it some.