My best guess depending on the fabric would be that it has started to undergo hydrolysis, which is a tricky one to come back from. (Very dependent on the age and materials of the fabric)
I would try contact Eiger Equipment, who I think are the main distributor here. I’ve never gotten around to it but I know they told me they would repair a beat up second hand MSR stove I picked up at some point.
A bit late to the party here, not sure where you are with this?
Last bit of info I received is that tent fabric is difficult and tedious to repair. I have heard some success stories of ordering replacement flysheets from wherever you bought the tent, or any MSR retailer - much more affordable than buying a whole new tent.