I have an older JD355D lawn tractor that runs great. It started showing the glow plug and temperature lights and disconnects the PTO. I previously located a forum thread that indicated that the problem was likely a dirty air filter. I changed the filter and it did great for several more mowings, ( I mow about 6 acres). The same thing is happening again, I checked the filter and cleaned it but it is still doing it. After sitting for a couple of hours, it will mow again. Does anyone know where to find out what the lights mean, or have an idea to correct the problem? Thank y’all!!