It's been a while since I had the case split open....and I don't have the manual in front of me. But IIRC, there is a single crown gear (I think it is called) that can be flipped to remedy situation. Check the forum for more info....
The hassle is of course removing the transmission, cracking it, flipping, resealing (hard to get it not to leak) and then going through the whole reinstall.
Me, I'd consider suing for incompetence and the cost of the rework..... or at least a 100% refund.