I run a smaller version - CP31, a three tank 12" wide machine, and boy are they nicely made inside. My only mechanical problem has been fatigued springs made from some exotic non reactive metal that tension the rollers. I replace them with square rubber belts from the electronics supply store, as they die off and I discover them ,or a rare jamb brings the situation to my attention. They seem to work fine and at $1 each, are a lot less than the OEM springs when I first went web looking for them, and found an old price listing for defunct minilab product support house.
There is no filters in the CP-31, but then again I drain my tanks and rinse racks every night I use it so there is limited chance to get gunkies to form that need to be filtered out (only 2L tanks to store) I do this because for me since it might be a few weeks or longer before I get back to it. I filter though a coffee filter before I pour back into the storage jug, or after I first put it in the tank, and see gunk in the bottom of the glass storage jug.
An electronic problem was the electronic thermostats seem to have some sort of component that went flaky; Mine only has an electronic thermostat on 1st tank; I swapped in a thermocouple furnace temp controller bought off of ebay, and run the first tank as a pre-wet. It takes a lot of dye off the supra paper, and I am convinced that keeping most of this dye out of the first dev the developer lasts a lot longer; I do not run control strips, but I have run 6 week old developer (stored in glass in dark if it was lightly used when first mixed, and do not see any difference in the images produced. I do pre-boil then let cool the reverse osmosis filtered water I dilute the Kodak RA-RT chems in, to minimize dissolved oxygen in the diluting water, and that seems to help too.
You may want to check out minilab supply. They likely have a filter option to offer to you, even if it is not an OEM filter option. The other option is to find a minilab support organization, and scavenge the filters out of an old kreonite etc and graft them onto the machine. I have a replenisher pump system from a Kreonite that I restored, and then later decided to scrap, that I plan to graft onto my cp-31 set up if I find time this winter.