Hope someone has some insight on this... I have a Lesco 54" Viper that I have used for 3 years. I bought the machine brand new and i'm the only one that mows with it. A month ago it started cutting uneven, and scalping during turns. The cut is about 3/4 inch lower on the right side of the deck. When I turn, it appears that the front of the deck cuts a half-moon in the turf. Air pressure in all tires is accurate, yes I have checked plenty of times. I have changed blades, and even bought a new set, still the same problem. I have greased everything with zerks, and sprayed WD-40 on all bushings and everything else associated with the deck. I have taken the mower to my local Lesco repair facility 3 times, he measures the blade height each time, and they are within 1/16th of an inch. I have run out of ideas. I don't know if a spindle could be broken, or the deck could be bent, the sidewalls on the tires are weak and flex??? Surely someone out there has been thru this too. Any help would be great! Thanks 