I wouldn't do ANY work on a Rollei unless you absolutely know what you're doing and you are planning on keeping the camera. They're beautiful machines, but they're fiddly, and I would not want to risk having a vendor void their return privilege because you tinkered with the camera.

Call KEH and ask them to either: service the camera or refund your money. They're well worth having serviced, it's just a question of logistics and whether it's simpler to just return this one and find another.