Just heard from them and they no longer do these re-builds. Any other suggestions? Anyone?
A servo rebuild is do-able by a decent shade tree mechanic; read the shop manual and understand how they work, but it's only a little more complex than rebuilding a MC. The seal in the vacuum canister can be problematic and there are a couple other 'gotchas' so if you want to try it ask the Forum for help. I rebuilt mine years ago and it's performed well for many years, but if you'd rather have a shop do it I have experience with Power Brake Exchange in San Jose, CA:
https://www.pwrbrake.com/
They rebuilt a booster for my dad's '46 Chevy 2-ton truck, and after we installed it my dad* said he 'almost went through the windshield' the first time he tried the brakes. I delivered and picked-up the booster; the shop is a mess but the crew is friendly and honest. I visited the work space of the tech who did our booster and he had some Girlings disassembled on the bench. However, it's my experience that a servo rebuild is a crap shoot, even done at a competent shop, but AFAIK PBE stands behind their work. NFI.
* My dad passed away last Friday. Those who have been on this forum for a while know my dad was my hero and a 'car guy' through and through. After he gave me a little bit of grief for buying a 'foreign car,' after I finally confessed I'd bought my BJ8, he found a '56 Healey in the local paper and bought it; I only found out afterward that it was a factory 100M. It took us over 10 years to restore it, mostly due to Dad having to endure a couple rounds of cancer. And, we got the fire engine he restored donated to the Modesto FD just a few months ago, so that was fortuitous.