Whirlpool gold g2 microven GH9177XLB-O ...

Question

For about 10 days taking longer and longer to heat or cook. Thought about calling someone.
Then one morning made a "poof" sound and the inside of the microven filled with smoke.
I unplugged it, and it has remained that way. Afraid to plug it back in.
Smells like burned electric wires.
Should I open it up?
Riker