I'd send Dean @ Dean's Camera Repair your AX, he'll be honest, and check the camera and tell you if he can/can't repair it, for no charge.
Let me tell you how good Dean is, I bought an absolutely mint(or so I thought) Nikon FM2n from a guy over e-bay, got the camera, and had Dean go over it. Dean being a qualified Nikon technician, checks it with all his instruments, tells me the camera is a great little camera, EXCEPT, that the guy forgot to tell me that he's either swung the camera lensfirst into a door, or dropped it, hitting lens first, because the lens wasn't seating right and presenting a corner soft, and he tells me by exactly how the much the tolerances are off.
Dean takes the camera apart, straigtens out everything, the camera is now truly in mint condition, and this was very cheap, his prices are surprising, which is why he repairs ALL my cameras, TLR's, my Mamiyas, my Contax, my Nikons, everything. His repairs for my Mamiya's are a fraction of what the factory technicians charge.
As previously mentioned, my AX was a conversation piece, until dean brought it back, so I'd contact him.
In terms of what you mentioned about exploring Zeiss glass, you'll get all sorts of opinions, ...............talking about Zeiss glass, tends to get some LeicaLovers all bent out of shape, which is hilarious, because the difference between the two, is like arguing about two very beautiful women, and who looks the best, and the truth being, you're lucky if you got either one.
Years ago, Zeiss was head and shoulders above most, Lieca glass notwithstanding,.............there was much talk about the Zeiss 'glow', some believed they could see, some insisted folks were 'talking' themselves into seeing something that wasn't there, regardless.................20-25yrs ago, to me, there were about the best.
Things changed, everybody else making glass got better, and raised their glass up into roughly the same ballpark as Zeiss glass, not the same as far as I'm concerned, because different lenses have different personalities, but to the point where you could say that the glass from the 'A' players was all good.
The lenses out there from the different lensmakers are so good, that the skill of the photographer using a particular lens will make a bigger difference than whatever the difference is between Zeiss or Leica glass or anything else.
Having said all this, if you invest in Contax, to explore Zeiss glass, I don't think you'll be disappointed
