The Patient Interface Module for the TC70 is a total replacement item, that is Philips Healthcare are not making spares available. It is a costly sum to replace this!
Black rubber base plate + top+bottom case + socket + top label, etc., should all be replaceable parts, simple enough to do.
As an example, rubber base plate, peeled off, damaged, contaminated. What are you doing to replace this? Have you requested parts from Philips?
Jim