Jay, Start by have a friendly discussion with ur original customer. Find out who is writing the check. He may not even know u r having trouble. Partners r many times married by money only not business practices. I have similar situations and just a well placed did you recieve my invoice for the xxx work? If yes then say is there a problem, because its not like u to be late. You get were I'm going. If no then say, Oh really well me get u a copy. I would be prepared to have one handy.
