I bought a used pair of CS3.7 and it turned out that it was massively messed up. I was able to rebuild everything with the remote help of Rob at
Coherent Source Service – Specializing in repair and restoration of THIEL Loudspeakers
He is in KY.
I was able to confirm that the end result was perfect by the services of Mitch Barnett at
Digital Room Calibration Services, Convolvers, Headphone Filtersets (accuratesound.ca)
It was not difficult to get the speaker back to perfect working order. I had to do some soldering of the driver connections and also the crossover.
I think my situation was a worst-case scenario, and it was not that difficult to get the speaker back to proper order.