JU88 & Lancaster AA-M

[zanekirk]

I am researching a JU88 shot down in combat with Lancaster AA-M [serial # ND756] of 75 (NZ) Squadron on the night of 28/29th July, 1944. The Lancaster was also shot down, crashing near the French village of Millery on the Moselle River, 14 km north of Nancy. Hptm. Martin Becker {2/NJG6} claimed the Lancaster, but it does not appear that it was his aircraft brought down during the combat as records show that Lancaster ND756 shot down at 1.25am was the first of four bombers claimed by Hptm. Becker that night. Records also state that Becker later landed safely at Wiesbaen-Erbenheim. Can anyone help trace the crew of the mystery JU88 that reportedy crashed just half a mile from the Lancaster.
Where does one search for Nachtjagd casualties?
I'll take all the advice I can get. Thanks.