Check Reissue Needed

I am the solo trustee for a late friend's estate and recently transferred his PG & E account into my name.  When I did so, the credit on his account was refunded to his estate.  Because there is no probate, and I am the successor trustee, all refunds need to be issued in my name.  (FYI, I have been paying all PG & E bills since his death in September of 2010.) What does PG & E need in terms of paper work to reissue the credit on my friend's account to me and to whom to do I send it?  If I wanted to bring the paper work in in person to an office/branch, where would I need to go?