[ccomer1955]

I just went through this with an old H model. I still haven't ruled out doing it myself, but there is a guy in Ohio, one in New Jersey, one in Utah, and one in Georgia in addition to several smaller shops with no web presence. This forum has a list in the resources section, but the cost will be somewhere between $50-$90 depending on who does the work. Add to that the cost of shipping the speaker both ways.

http://www.philcoradio.com/resourceb.htm