overnight, tractor has no power, like the brakes are stuck. even low range 1st gear it wouldn't climb curbing (6" slab) to park in shed. almost seems like the clutch is slipping, but it doesn't whine or anything. i usually take off in 2 range 1st gear if i'm traveling somewhere but now it won't budge. recently serviced and fluids are full. no noises or anything that appears to be out of the ordinary. engine revs up good. had to rev to 3000 rpms today just to pull onto trailer in lowest gear. clutch adjustment maybe? advice is greatly appreciated.