Removal of Musical Fidelity X-150 phono stage

Does anyone have any experience of removing the phono stage from a
Musical Fidelity X-150 amplifier?
There is a separate riser PCB from the main PCB which has "PHONO MM"
written on it together with a number of connections to the main PCB but
without some more info I don't know what to do.
Apparently the lower powered X-80 amplifier (which does not have the
phono input) shares the same PCB and can be upgraded to the same specs
as the X-150 including changing a line input to phono. All I want to do
is reverse this step!
Any help much appreciated.

Richard