I recently reread Dave Hamley's 6-part article about the disposition
of all PRCo/PAT PCCs.  In it was a list of 10 of the PAT rebuilds
and the car that some of the parts came from. 
 4011 is not in that list. I know 4012 was actually 4000 renumbered.
No mention as to 4011's origin. Dave did mention where it ended up
though. Was 4011 another renumbering? If not, what original PAT 1700
series car was used to make 4011?

                        Mark