Welcome to the forum. Make sure to try out each and every system, switch and check the tires for wear. You should also check the engine battery and the coach batteries. The coach batteries may be near the end of their useful life. Look for any leaks on the ground where ever it is parked. If possible go up on the roof and check the seams and seals around the vents/air conditioner.
Good luck and enjoy the new ride.
Paul
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