Our 06 MC used a paddle-wheel only, and I'm pretty sure the 05's did as well, so I doubt there's a pitot to dig junk out of. Does you PP run off the paddlewheel, or has it been upgraded to GPS. If it's off the paddle-wheel and is working fine, it sounds like a gauge issue, signal issue between paddlewheel and gauge, or power issue to the gauge.
If your PP is a GPS unit, then your paddlewheel could be the culprit, as they've been known to go bad. Get underneath and make sure it spins freely. You can also manually turn them (compressed air or hose are easiest) on the trailer/lift to check the response at the gauge