Thank you for the perspectives; they are all very valid. I have a little period remaining until the subsequent service is required.I will have my local MB indie elevate the vehicle on a ramp to do a thorough inspection of the subframe. Historically, they have sent vehicles to Mercedes for subframe repair without encountering difficulty when problems were identified. They noted that MB is becoming stricter, particularly in cases with incomplete history or significant non-MB work.
If everything seems OK, I will likely forgo the MB option, since the car is intended for weekend use in ideal weather, with my primary vehicle being a Tesla, resulting in limited miles.
I frequented MBS many years before when they operated from the 'huge shed.' The current Southampton facility is superior, albeit it requires a longer journey. To be candid, I am fortunate to have both them and PCS in such proximity.
Let us await the local independent's feedback about the subframe inspection.
Thank you