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They are glued in with Urethane adhesive sealant and must be cut out. There are special tools for cutting it. You can use an "L" shaped knife with a cable to pull it or something like a piano wire to saw through it. You will need some help from a good friend. Be sure to treat all the metal and glass that will be exposed to the urethane window weld with a special primer that is made for that purpose.
Sounds like a linkage (wiper transmission) problem. But, put an external ground wire to the wiper motor first and see if they work then. Also many wipers have a fastening nut on the wiper arm where it attaches to the stub that goes through the body. These may have loosened and gone out of adjustment. If so, loosen them and re-position arms, then tighten them down.
Neither the needle up/down or the LED for the stitch selector will work if the bobbin winding pin/holder is pushed to the right (meaning pushed into the winding position). If you accidentally left the winding pin/holder pushed over, you will lose the functions of both the LEAD and the needle up/down button! (Neither of these functions can work while in bobbin winding mode!)