Hi!
I read your comment about needing to remove the control board to inspect it for damage. Looking at the diag. below, all you need to do is open the oven door and remove the two screws (#2 on diag.) fastening the brackets that hold the board in place and you can take it from there.
Refer to the diag. below
If it was me, I would start by turning the breakers for both ovens OFF, then, in getting someone to help me pull the oven out, disconnect the power cord and check the power circuit protection devices like the fuse #4, located above the fan and the power board #25 also located on the back of the unit. Before replacing the blown fuse, inspect the wiring, If the unit is mounted over an oven that was in the Self Cleaning Mode that reaches temps. of about 500 degrees, there is a chance that a wire's insulation melted and shorted the unit.
If you need better resolution and the names and prices of the components on these diagrams, click on the following links:
for the first diag:
http://www.searspartsdirect.com/partsdirect/part-model/Jenn-air-Parts/Microwave-Parts/Model-JMC8130DDB/1266/0123100/M0512405/00001?blt=06&prst=0&shdMod=JMC8130DDB
for the second diag:
http://www.searspartsdirect.com/partsdirect/part-model/Jenn-air-Parts/Microwave-Parts/Model-JMC8130DDB/1266/0123100/M0512405/00004?blt=06&prst=0&shdMod=JMC8130DDB
I hope this info is helpful to you. If you need further assistance, just place a comment.