Hi Frankie. This must have been a "target of opportunity" as only 10 bombs; a long way from the Primary targets on the 29th. (1st. Div. B-17s to Misburg-Hanover, 3rd. Div. B-17s to Hamm); and Grevenbroich is NW of Cologne not far from Niederaussem.
This is the Grevenbroich web-site; go to "Table of Contents" and p.129 "1944 beware low-flying aircraft". There may be something there but I can't view it.
(The B-24 lost came down 20M. NW of Paderborn at 12.57 but it looks like it was a B-17 whatever the date).
Nick
https://portal-dnb-de.translate.goog...n&_x_tr_pto=sc