[Yaesu] 620b If alignment - similar to ???

[Hamel Family]

The 620B book I have thanks to this list does not go into detail with
voltages, etc.
The receiver is dying as it warms up.
Looking at the lineup, it may be using the same IF board as another Yaesu HF
rig.
That rig may have the voltages and alignment points in it's book.
(This is my first Yaesu rig)
If someone knows that IF board, I really would appreciate some advice on
which test points to monitor as it warms up.
Reinventing the wheel and Easter-egging can be so frustrating !
Thanks