Possibly the fuse underneath the playfield, hidden amongst the actual flipper and slingshot wiring. Make sure to replace with the correct fuse!
It should be a 1 amp slow blow 250v.
A similar playfield view attached. You should be able to see it just by opening the coin door. Look for double brown wires on one side of the fuse holder and double yellow on the other side.
Use a flashlight and keep the machine off during the entire process!