If the 3MP31702 is tripping frequently but isn't broken, it’s doing its job to prevent a fire. You need to fix what’s causing the motor to overheat :

Remove the outer housing (standard Phillips or Torx screws).

Replace the unit. These are precision-calibrated safety devices; attempting to pry open the metal housing to "fix" the internal contacts is a fire hazard. 3. Address the Root Cause

If you've determined the 3MP31702 is dead, you can find replacement Klixon parts online.