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pH controller

This talk about the pH controller prompts a question:
I have an UltraReef MD-101 which doesn't work properly - it will not show a
pH below 4.8 (or there about). The 7.00 calibration setting works, but the
slope setting to 4.01 doesn't. Needless to say, any measurement other than 7
is suspect.

On the inside, there are two adjustable components (pots?) with perhaps a
270 degree range i.e. the screw turns from left to right in a 270 degree
arc. I played with them, but it didn't help.
Does anyone have any idea what they are, how to adjust them or anything else
helpful to get this unit back into business?

Michael Eckardt