Don't have a tech in NY for you, but do review this website:
www.joeysbassnotes.com. Joey has numerous Rick 4001s and 4003s. He's very knowledgeable on set-ups, so you might be able to do-it-yourself from what you learn.
Joey is from NY, but now lives in So. Cal. He might be able to refer you to a trustworthy tech in NY. On the
www.rickenbacker.com forum, his name is 'rickenbrother'.
I think he posts on this forum, as well. I just don't know his call name.
FYI: I checked his website and he is doing maintenance. I'm sure it will be operating again in a few days.