hello lloyd,
first of all: thank you for your fast reply and support... you're always great!
all problems are fixed now.
the right bumper had a loose connector on the board.
the drawbridge and both gates was the result of a broken fuse (f1/gate on the playfield board).
before removing the fuse you couldn't see that it's broken. it's not damaged by a spike, think it's a mechanical damage (maybe from the shaker). the small wire is a little bit broken at the end of the fuse and so you can't see it without removing the fuse.
i changed the fuse now but you have to do the "autotest" before, if not, the alert is still on and the bridge doesn't work.
thank you for help and best regards from austria!
p.s.: in österreich (austria) spricht man deutsch, nicht zu verwechseln mit australien, wo englisch muttersprache ist.