Who rebuilds 727's?

Get a manual and do it yourself, they are really not that complicated and you will have the pride of saying "I built that".
My biggest issue was lack of tools to do the full rebuild. Taking it apart is not the issue, but replacing bushings & getting that drum piston retainer back together was a real challenge. Back when I did it there was no internet so I had no idea what to look for when inspecting the hard parts. If I had to do it today and had all the proper tools it would be a different story entirely. Lots of great parts now to beef up the weak areas.