UPDATE FIXED JAN 2025

Yes, problem has been solved. I chased the issue for some time by myself, but it was really beyond my skillset. For someone that knows what they are doing-it took my mechanic who has worked on Mercedes for 14 years about 20 minutes. He used a multimeter and targeted the Brake Booster Sensor/Brake Booster Diaphram Position Sensor Part Number: 6500-08044460-info from Partsgeek.com (Chrysler Crossfire Service Manual calls the part "BAS Diaphram Travel Sensor"). He showed me that there was a possible voltage drop that seemed miniscule to me. I don't remember the #, but maybe it should have read 5 and it was 4.9. To me, that was close enough, but not in spec for him.

So the brake booster sensor came in to be replaced. (simple fix using a longer pick set) When he removed the brake booster sensor, it came out a littlle wet. Not knowing what I don't know, I would have just replaced it. He informed me that it should be DRY. So that meant that the master cylinder had leaked into the brake booster. So the brake master cylinder, brake booster and sensor had to be replaced. It has been fixed since January of 2025. The person who I purchased the car from, had a used/original brake booster from a parts car and mailed it to me saving me a hundreds of dollars. (Mercedes may sell a new brake booster for $800?)..