Sounds like your in the same situation as me. I have received the recall notice, but haven't arranged for my MP to go to a dealership yet. I will be interested in hearing more about your MP and the recall. Good luck !!
My 2018 MP went to MB to have the starter battery replaced under warranty (it was apparently draining the aux battery) and they adjusted the switches in the roof as part of a “service item”. MB also replaced the upper mattress but I didn’t notice until I got home. It looks exactly the same as the old mattress so don’t know why. Would add very pleased with MB South West dealership.
Took mine for the recall to Mercedes Epsom as well. They confirmed no corrosion last week. I had a chance to look at it over the weekend, found some mark one the surface of the metal work but not sure if it's corrosion. Please can anyone confirm? Thanks