g bg says:

anything I can do for preventative maintenance to stop the squeaking,
outside of pulling the unit?


just kidding.
Pee oil?
/just kidding

Peggie is undoubtedly the expert in matters of the head, but my guess would be
that you need to pul it to find out _where_ it squeaketh from. It would also
allow you to "get to know" the system in a non-stress situation, rather than
having to discover things while the pan is full in a small hurricane.

Just a thought..

Steve