I had the same problem (M28RM-4).
1) This type of thermostat can still be taken apart, ie. it is not riveted like the newer ones. Take it apart and clean the contacts. It should work like new.
2) Both upper and lower ovens work off the same type thermostat. If for some reason #1 does not work, swap the relay part of the thermostat. If it still does not work, it is in the bimetal thermostat part and that part will need to be swapped with the upper oven.
Email me if you have any questions: [email protected] .
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