Hi Mystic
I will give it a go,
Are you sure the the code is FL because all KG\76 Aircraft I have researched
seem to have F1 prefix Code?
Also the Shield on the side of the JU88 appears to be that of 9\KG76 which
I have only seen on Dornier Do-17 BUT the photo shows it clear as day

I dont suppose you know what the Code colours were,I will use the AC in the background as a Guide but there will be some guess work involved without any
more photos or info.
Bit of an Enigma this one

Regards
Keith