I took one of these apart a long time ago, but my memories are in line with the HiMatic 9 page, above.
The chances are the fungus is on the back of the front lens group or on the front of the back group. If remove the front group then you should have access to both surfaces.
I would shoot a few rolls with the camera as it is first to be extra sure everything is in working order. Major repairs on this camera - shutter, aperture, metering - are a nightmare.