I bought mine new in 02 and until recently it mowed perfectly. Somehow it is cutting deeper on one side now. I leveled the deck with a level and its worse. I measured each side to be even and still have the trouble. I tried adjusting the air pressure on the back tires and that has little effect. I can adjust it to mow fairly level but its almost an inch off from one side to the other. My blades appear to be straight, im at a loss. Any suggestions?