mY z1803k snapper zero turn started slowing down going forward gooing uphill and pulls to left after 20 minutes of use. It will cool down for about 30 minutes and run fine for 20 minutes of use then make groaning noise when push joystick to right going up hills and continue to turn left a little. I can back up and go forward for a little bit and then acts up again. Fluid is a little above cold mark and notice condensation on reservoir cap. Any Ideas..