Are warning messages logged?

[Clutch]

Hello again all -

I searched and found many instances of people getting the "CHECK BRAKE LIGHTS" and "CHECK REAR LIGHTS" warning messages on an intermittent basis, just as I am getting now. All bulbs are fine; seems to happen on damp mornings, so I am thinking a condensation short, but reading here points to a generic corrosion problem with the units. In fact, our 2005 4.4 had the left side replaced out of warranty for a hefty price. My 2006 4.8 warranty ends in a bit over a week. Although I have read the fixes and advice here, I'd rather the dealer replace the units now, or at least get on the record of a problem *before* the warranty expires. With that long background, my specific question is - are these error codes logged in the computer? - Will the dealer see them there and I can therefore "prove" it's been happening, or will it be my word against their "Problem Not Found" diagnosis? This thread kinda implies that they are stored:

http://www.xoutpost.com/bmw-sav-forums/x5-e53-forum/37249-x5-tail-light-alteration-fix.html

but doesn't mention reading them in the TSB below. Sorry so long for a simple question, but I'm learning about the fault and logging functions. Thank you in advance for your time and information.