59 SEC NEED TO GET FRONT OFF MICRO

If your unit runs for 59 seconds then stops, the problem is the convection damper motor. (Sharp part # RMOTDA222WREZ).
Unfortunately, you cannot access this from the front - the whole unit has to come down as the entire outside cover has to be removed.
This is a pretty major job and the motor (located below and behind the magnetron tube) is rather hard to remove and get back into place. This is probably better left to an experienced technician. You can call Sharp 1-800-BE SHARP for a referral to an authorized servicer.