Brembo's situation is akin to every episode of Dog Whisperer that I've ever seen where a single event has led to a lifetime of fearfulness. In every single situation though, the corrective action has been the same; experiencing the scary thing, seeing nothing bad will happen, and getting through it. I would imagine that your girlfriend may be part of the problem. This thing happened on her watch and she's sharing fearful energy -- which only trigger's Brembo's fears. If his human pack leader is anxious, there must be a reason to be afraid, right?
Bea and Bo began to develop an unreasonable fear to the back hatch door of my Ford Explorer shutting. They didn't want to go "bye bye" because of it and getting them into the SUV was starting to become such a hassle that I didn't want to deal with it. BUT I HAD TO. That's the way we get to fun places! The "process" to getting into the truck is always exactly the same (so they know what to expect) and I noticed points where both Bea and Bo were getting "stuck" in this process. The only way out is through so patience (from me) and my calmest most assertive self was absolutely required. Humans tend to be in a hurry for everything. Deal with his unreasonable fear only when you have the time to do so. Rehabilitating fear cannot be rushed. There is still a certain point where Bea gets "stuck" but I don't hurry and we get through it and (hopefully) it's better the next time.
Brembo has had a really cool life so far --- classes and lots of unusual experiences! He is well on his way to being that Service Dog you want and he will enjoy being. And remember, he's 11 months old --- he's a "kid". Be his unwavering, solid and confident pack leader and he will follow you through ANYTHING, I promise!!!