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Autohaus Lake Norman
Sounds like your car has Airmatic Suspension. You may have a leaking rear strut or failed air line. This will need to be diagnosed by a competent repair shop, hopefully one that is familiar with Mercedes.
The engines don't use a traditional "PCV" system. They use an "oil trap" system, like found in this link: http://www.fcpeuro.com/products/volvo-pcv-breather-system-kit-c70-s70-v70-s60-turbo-v70t100
No certain way. It screws off and screws back on. It is possible that the seal has expanded a little and preventing you from seating it down far enough for the threads to engage. You may need to press down on the cap firmly, then try and twist to engage the threads. If that doesn't help, you may need to replace the cap.
These emblems are usually retained by either two or three posts, that push into retainers, or also with double sided tape (adhesive). Usually, a plastic pick or trim tool will remove them. Hopefully you are installing a new one, as the old one may break during removal.
Have them re-inspect the work that was done. Could be a defective part, or improper installation. Could also be a misdiagnosis on the original repair.
Some of these cars have an updated harness, which adds an additional ground to the lamps, to help prevent the sockets from overheating.
To be able to pinpoint the problem, without performing a diagnosis is impossible. The ABS system will need to be scanned for Fault Codes, to see what sub system is malfunctioning. Based on your description, it could be an issue with a Wheel speed sensor, but a proper diagnosis would need to be done FIRST.
More than likely a software update. The factory trailer brake systems have been a headache since the feature rolled out on this body style truck. Several bulletins have been released, which if still under warranty, should be fixed for free.
There is a disable button in the overhead console. Make sure its not disabled.
Once you remove the giant airbox on top of the engine, the MAF simply unclips from the back of the intake. There is one electrical connectors and two clips.