Have a chat with Chrisiball, he's rebuilt a 748R in a similar mess
http://www.ducatisportingclub.com/xm....php?tid=14312 What does that cover actually close off on the engine casing (Cam bearings I think)? Is there fluid coming out or is it dry behind? If it's dry open it up( may need new bearings just in case), re-weld (JB weld for a temp fix) bolt it back on.
[Edited on 28-4-2005 by Mr_S]