D70s problem

it won't be worth repairing, if you are OK with dismantling it you should be able to fix the micro-switch.
 
There is a 50/50 chance that it could be lens contact related, remove the lens and give the contacts a clean with a pencil rubber, it may or may not help in this case, but it is surprising how many issues this will resolve.

Worth a try, it won't cost anything.
 
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