2008 Mercedes-Benz GL320 CDI Questions

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Te engine light is on. One shop said I need to replace MAF censors (two units) while the scanner in the other shop says only left sensor, Component B2/6 Left hot film mass air flow sensor is bad? Are they talking about the same thing? Also, Exhaust gas recirculation control code came on. Is this because the MAF is bad, or it's a separate issue? Someone help me. I spent way too much money in the past year on this car. I can't afford getting ripped off.
2008 GL CDI bought new 2009, in Canada, Have towed 8000# Airstream trailer all over USA & Canada, from time to time. No previous transmission problems but sometimes used to clunk, when I put it in gear. Transmission paddle shifters work fine. MB Dealer diagnosed and Replaced Torque Convertor. Flushed and replaced transmission Fluid. Starts OK BUT has problem shifting into gear, reverse more than forward, when engine is cold but especially when the car has been parked nose down overnight. Almost feels like brakes are on? (Not the case!). May stall a few times if cold. Runs fine, shifts smooth once it gets warmed up. No noticeable clunking when I put it in gear now. Could the problem be low transmission fluid level or wrong type of Fluid? Too Viscous i.e. heavy.
drive car without changing gear to work shop sign , after couple of times the car started but after a mile it started to jump. first time
Is it ok to drive to dealership to put on diagnostics machine?
I replaced the exhaust temp sensor, but the error code keeps coming back. Please help?
N0. 2 glow plug and module
How much cost?
GL 320 diesel
Simple right? Need to change the GL320 engine oil and filter and then reset the dashboard service warning for a future time. I am certain it is all a simple process, but I would appreciate it detailed explained so I do it right. Thanks!
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