Hi,

I was bench testing an AFM. I get around 225ohm between 6 & 8 and 125ohm between 8 & 9.

Has anyone seen this? does it mean it is too much and it requires cleaning and re-calibration?

https://www.atlanticz.ca/zclub/techtips/afm/index.html

Measure the resistance from the high side to the low side of the pot/copper trace. (Pins 8 and 6). It should read ~180ohm
Measure the resistance across the "standard"/"Reference"/"Control" resistor. (Pins 8 and 9). It should read 100ohms

I have.  The AFM worked fine though.  Notice that the ratio is still 1.8, just like if you had 180 and 100.  I don't really know how the AFM works so can't say if that means anything.