I installed a new brake light switch tonight. No change in BAS light or spoiler automatic deployment situation. The old switch was still working the brake lights correctly. Two rear wheel speed sensors due this week. After that, guess I need a new scanner that will penetrate the Mercedes computer systems modules. And the five minute fix to replace a brake light switch took about 45 minutes or more, on my back with little room to work. Wiring plugs were the toughest part to get them removed. Might go quicker on the second time.