My 540H has been re powered with a Honda V twin. I flat wore out the onan. I had to rebuild the center console this spring. After a hard working summer powering the 60inch heavy mower deck, I find the frame Has cracked a few inches Behring the engine mounting plate at the station where the floor board front mounting bar is welded to the frame. After 20years of blowing snow and powering the HD 60" deck I noticed a "sag". Engine is out do I repair or replace. Has anyone had success with repairs at this frame location?