UPDATE ON MALFUNCTION INDICATOR DASH LIGHT -
Finally got to a Freightliner shop and was told all they found for the malfunction light coming on was a sensor plug not completely seated in place. Said this was sort of like an anti-knock sensor. Also had the dash air conditioner checked and they found only .49 lbs of freon when it should have had 3 lbs. Filled the system and checked for any leaks, none found. So conclusion was that Freightliner initially didn't fill the system with the correct amount of freon. This was all under warranty thank goodness.
While in the shop I had them change the engine brake to come on when the service brake is activated instead of every time the throttle is released. This cost me almost an hours labor, which was pretty steep for about 15 minutes time connecting laptop and changing the settings, but then they charge an additional $15 for shop/misc fees (what shop supplies could they have possibly used in connecting a laptop) and also $9 sales tax.