One of the mechanics I know used to work for Kernahan's in Witney, this was a MGR dealership and they sold several 260's. He was telling me some 260's had to go back to the factory as some faults were unfixable at the dealerships even though they had all the tools and diagnostic software.

Interstingly they had one car with a heater stuck on hot that ended up going back to the factory.

Steve