I don't believe its illegal to remove it yourself, you do need a certified contractor to remove the 'uffi branding' that allows you to declare no UFFI disclosure as a future sale requirement.
My knee jerk reaction to not being able to do it yourself is that you can do anything you want to your house at your health risk, some specific exceptions. Run gas pipes and wires anywhere you want, just don't expect them to be connected to a source or be insured.
However the disposal of the foam could be an issue. There were horror stories of people being left with devices containing PCB's and having to store them like nuclear waste or pay a fortune to get rid of them.
The government will pass a law banning a product but leave the end user up a creek when they have to dispose of it. A reasonably run central containment would be a good idea but the government says "Tough luck, your problem." If a person suspects they have a PCB item they go for a midnight drive and dump it in a ditch or farmer's field access.
A number of years ago the OPP stopped pickup on the 400 IIRC for an unsecured load, dust blowing around. It turned out to be asbestos. That got a special ticket.
Atomic Energy paid a contractor to dispose of some hazmat. A couple of days later the OPP showed up at their door asking why all the AE junk was laying in a ditch in Caledon.
An underlying concern is that as a problem escalates the legal costs escalate exponentially. John and Joe have a problem. If they can resolve it over a beer the monies spent go into fixing the problem. "If you do this, I'll do that, want another beer?"
If one party says "Let me check with my lawyer" costs ramp up. If the lawyer needs to consult an engineer and the engineer needs to consult the device manufacturer who in turn needs to consult his lawyer....the other side is forced to match the fight. $$$$$$$$$$ and years before anything gets done.
Check your own sources but IIRC you have two years from when the problem was found to initiate action. Someone please confirm as things change.
Right now a lot of this is speculation so some facts are needed.
1) Is it UFFI? If not move on. If yes contact the appropriate parties with the planned route to resolution if there isn't cooperation. Concealment will just make it worse.
I was fault locating a new snow melting system and was at the point of flipping a coin as to whether the problem was in the N-W corner or S-E. A bunch of concrete workers were watching me so I told them I would find the fault and the longer it took the more it would cost. "Not blaming anyone but if you were to guess which corner it was in where would you dig?" They all pointed to the S-E. Yup, there it was.
How does one find out if the foam is UFFI without setting off alarms? It's hard to un-ring a bell and there are too many vultures sitting on the fence waiting for it to ring.