Oh I am so relieved to hear that they have found the issue...and it sounds better than what I feared it might be...AAI . That is operable but a bit trickier. I had a pup with herniated discs in his neck and he did terrific in his recovery! Dogs usually recover quickly from disc surgery .. actually better than humans because they walk on all fours rather than standing upright like humans.
Praying that all is going well!