This part is pretty funny actually. Since he is the handling warranty claims and the saw can be put back to factory condition in seconds, how is that effecting the "warranty status"?
A quick reply.
1. The memorandum of understanding, is just an agreement thats non legally binding and non-legally enforceable. The EPA and Environment Canada have solely an agreement in principle.
2. Not allowing the tank to vent to the atmoshphere. In normal use fumes from the vent are added into the intake charge of fuel in the carb and the AT system compensates (lower overall fuel consumption).
3. The Echo vent allows the tank to vent directly to the atmosphere.
5. Non authorized modifications, pretty simple actually.