The op seems to just be using the location for free storage
That happens a lot with equipment that doens't bring in a lot of money, but it would be more trouble getting it off a location than it's worth.
We have a location just up the road from me. I had to go put records on the jukebox there. When I got there, *nothing* was on. I asked if it was out of order, and the location told me "no, we only turn it on if someone wants to play." HE-LO-OH! 95% of this industry (unless you actually go to a place to play) is spontaneous. If the equipment is *off* people will assume it doesn't work, and therefore not even bother!
So I ask the boss about this, say "why don't you pull it? It sure doesn't earn much, esp since the location doesn't seem to care". He shrugs, smiles, and says "it's free warm storage that brings me money every few months." He's right. The equipment is paid for, and then some. It would cost a heap in gas money to pick it up, so it's best where it is.
As for the non-working pin, keep leaning on the location guy, as well as the op. Offer him a price. Tell him you'll just haul it away, he doesn't have to worry about it any more. Every time you see him, lower your price by just a little bit.