generally mastro is pretty good with the aftermarket area. unless the dp is causing a problem or the reason for your service than you should be fine.
(ie. if your window stops working they can't void your warranty because of the dp.)
you should get the cel fix on though. for a few reasons.
the reason you have a cel and cruise flashing is because of the dp with no cel fix. if that's the reason you're taking it in, get the fix first and go have the code cleared and cancel your appointment.