R-9H84B - May 29, 2017
I would suggest pulling the control board out and looking on the foil side (opposite the component side) for "ring cracks," most likely on the low voltage transformer's connections.
The board may have the screen-printed reference designator "T1" near the low voltage transformer.
Also be sure the fuse is not easy to turn with your fingertips when it is in the holder. If it is, the fuse holder is too loose and must be replaced (not just squeezed with pliers).
You can order a fuse holder, part number WB06X10034
for $6.49 (subject to change) from the Pros here
If you have any keypad issues, please note that the membrane keypads for this model have long been discontinued.
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