Rear tire on my 1025r has gone flat 3 times in the past 4 months. First time, pumped it up, no issues for 3 months. Last week at the height of the nor'easter (Tuesday), go to start cleaning up the driveway, dead flat. PIA to get the wheel off and into the garage. Thankfully still have the backhoe on and can used the outriggers to jack up the rear. Re-inflate and it was fine until this morning when it was flat again. Re-inflate, and sprayed soapy water around the bead on each side, around and in the valve stem. No bubbles. Checked the tread visually and with soapy water and still didn't find the leak. Anyone got any ideas short of submerging it? Thanks.