sounds like you handled everything very well. I once had an alternator fail in a 182 right after depature in IMC. I told the controler I needed vectors to the approach at my departure airport due to "mechanical problems" The controller actually declared an emergency for me and I had the whole parade of fire trucks, ambulances, and cops along the runway when i landed. at the time, I was kind of worried about it, but looking back, I am glad that the controller did that for me even though it really wasnt that serious being that I was only 5 minutes from the airport.
There was no paperwork, and I was never contacted by the FAA. I did file an ASRS report though, and i think the original poster in this thread should do the same.