Originally posted by KDAFA I suggested the lens be placed in a cabinet and checked after a week or two to see if things cleared up on their own.
This sounds like a good first step.
If condensation has made its way into the air gaps
between elements 5/6 or 8/9,
it could take a while to clear.
Originally posted by KDAFA Failing which, I may have no choice but to send it to Japan. If indeed it is a glue issue (element 3/4), then that would seem to be the right course of action, anyhow.
Originally posted by KDAFA But guys, what do you all think Pentax Japan will do? Will they entirely replace elements 3/4? Or pry them apart, clean them up, and re-apply fresh glue – if such a process is even possible?
I would recommend you to read
The Zeiss Ikon Contax Camera Repair Website - Overhauling A Contax IIA/IIIA - Lenses
Although it applies specifically to Zeiss lenses, it may be relevant anyway.
It suggests that an overall fog would not be typical of glue issues,
but rather that they would make themselves known
with bubbles (in balsam) or "iridescent edge separation" (with epoxy).
There are illustrations of what those look like.
Later, there is a discussion of possible repair methods.