Panasonic NN-DF383B Service Manual page 19

6. Remove 1 screw holding orifice on base plate.
7. Remove base plate from oven assy.
8. Remove 4 screws holding lower heater panel on the bottom
of oven cavity.
9. Release the catch hook holding orifice and then remove the
orifice.
10. Remove 2 screws holding lead wire terminals on lower
heaters.
11. Take away the whole lower heater assembly.
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NN-DF383B