Master Warning Light When Turning Left

I've searched around and can't find anyone experiencing these symptoms:

Thursday, I was turning onto I-90/94 from Congress (left hand cloverleaf) and I heard a beep, and saw the Master Warning (triangle containing !) flashed for less than a second. I read the forums and thought that it may have been a loose door and figured 'no big deal if it only happens once'.

Today again on an off-ramp turning left, I hear 'beep', see the warning flash again for less than a second. I know that the MFD displays information about the error but it flashes so fast that I don't have any time to read the MFD description. Recalling the 'open door' issue, I then pushed hard on the drivers door to see if I leaned on it and that is causing the issue. No warning light if I try to duplicate it. For the rest of our drive, I tried to turn left as sharply as possible attempting to make it happen again. Again I received no warning.

I have checked for DTC's and there are none stored in the computer. The door switch appears to be working properly as well. My questions:

1. Is there any way to obtain a log of warnings posted by the MFD?
2. Is there any way to obtain a log of events causing a 'master warning'?
3. Are there any TSB's / computer updates regarding this issue?

Since this has happened twice now (now that I think about it, it happened about the same time of day), if I connect my laptop to the ODB-2 port and record the real time data, does a DTC always get posted when the 'master warning' happens?

I have the extended warranty until 100K but I don't think that the warranty covers investigative time. I hate to pay the dealer to tell me 'couldn't find anything wrong'. Thanks for all of your assistance!