Re: Mark VI Alto Needs Adjusting
A horn doesn't normally fall out of tune if it used to play in tune unless some significant damage has occurred up high - like the neck is caved in. Are you using the same mouthpiece? Certain pad leaks can cause intonation to fluctuate, but you would notice probably that the sound was suffering as well.
If you stepped away from the horn for a number of years, you may have come back to it with enough of a different embouchre that you might need to build it back up or consider a different mouthpiece. I'm assuming you are using the Soloist it came with?
Sticky keys and regulation are very solvable problems unless the hinge rod is bent into a pretzel.
Check your email as I'd be glad to assist you with your dilemmas.