The Flight Status info on EF is also unusually quiet about the cause of the cancellation - usually there is a note about WX, ATC, CREW, MX, etc. Maybe there isn't a code for "pilot hauled away in metal bracelets" or maybe that's what "-XOP" means?
Code:
MAN 1105A 55
PHL CUST A20 220P
1FX CANCEL MAN -PHL -XOP *0656
7MAN/AUTO REACCOM CXL FLT COMPLETED SEE N*P2AA0735MAN07FEB *0730*CRCYMG