Everything sounds fixable. Whether or not you are interested in fixing it is up to you.

Condition also generally determines price. Photos would help greatly.

Ballpark figure--probably $300-$500, depending on condition.

I traded for and sold one with some touchup on the backglass and playfield, but fully working. I valued it around $500-600 in the trade, and sold it for $450-500 I think

Yours sounds like it's a bit nicer cosmetically, and would be a better example if you had all the displays and lamps worked. As it stands, I'd value it around the same as my old game. $500 or a little less

None of the problems you describe are expensive fixes. Probably $10-15 total for the lights and the displays, unless you're unlucky. Lockdown bar might be tricky depending on what parts are broken/missing. One question left is if there's any corrosion on the MPU. It could be destroyed but still 'working' for all we know.

I'd've given ya $400 for it without pics if you were closer