Well, happy to report that after all this time, my dealer finally came out and fixed the issue. They replaced both cylinders with new ones. It obviously wasn't a burning concern for anybody so they didn't come until they had other work to do on the tractor. I sprung a coolant leak in the roof of the cab in the heating/cooling system. They had to disassemble just about everything to get at it, but it's fixed to, just in time for cooler weather.