Keep in mind this is second hand information and I have not seen the below described things with my own eyeballs.

Ed is still in repair mode.  One of the apex seal corner pieces disappeared during disassembly and I just sent him a replacement apex seal. 

A Coolant O-ring is heat damaged in one spot which corresponds to a heat damaged spot near the o-ring groove on BOTH side housings of the affected rotor.  The metal is blued in  'thumbprint' sized spots indicating very high temperatures. 

This is an entirely new symptom that has never been seen before (at least by me).  The only logical explanation would be a defective rotor housing (too narrow in one place) causing the side housings to be brought into contact with the sides of the rotor when it heated up.   Remember that Ed's engine was very 'tight' after his last overhaul which was NOT normal for a 2nd gen engine and should be cause for concern. 

While this is the 'logical' conclusion, I think it is very unlikely.  The cause will probably be something unexpected and maybe not ever explained.  Ed seems to get all of these : )

Tracy