Houston users

Hey Houston users…
I found one last year and love it.
The only anomaly is that the faders don’t zero at zero.
I’ve run all the reset and calibration methods I’ve found on line and run the long ass fader check, to no avail.
The unit I bought was shipped from England and now resides in Canada.
Do any of you Houstonites/techs out there know about something I’m missing?
Is there and internal dip switch or something that might remedy this?
I sure wish Steiney would offer something like it again, I know I’m not alone on this.
Thanks in advance.