As some may remember, on our 2551, we had a problem with the toilet seat hinge pin falling out and plugging the macerator. While at the Tampa RV Show, I spoke with the Thetford service rep. I explained the problem with the hinge pin falling out on both our 2551 and with our new 2013 2910. He said that Thetford has, as of June, changed the hinge pin design. He suggested to call their customer service number with model and serial number and ask for a replacement. The new seat arrived today.
The serial number is on the back of the toilet. I used a digital camera to take a photo so as to read the info.
This sounds like a problem that I would like to avoid, thanks for the heads up. However, I checked the toilet in my 2010 2551 and I don't see a hinge pin for the seat that might fall out into the bowl. Could you provide more details so that I can see exactly what the problem is.