Clean the joint and stick some masking tape around - all the way around if possible. Any leak should show on the tape. If it wont stay stuck, use some dabs of gaffa tape to hold it.
Silly question but, whats behind the front engine cover on a 1200GS engine? I have oil in my bash plate, not a huge amount but it doesn't appear to be coming from Sump plug or oil filter so could it come from anywhere else?
Not yet as still under 2 year old so should be still under warranty! Just a nagging thought, where on the twin cam uses a plate bolted to the bottom of engine cases, the plate appears to have been put in by a gorilla as the nut n bolt are so tight that the alli casing has been distorted. This is proving to have pretty poor build quality compared to my earlier 1200's