Peter,
Have you seen these primary documents? There are some errors, but overall it is the best we have.
1/RAAF Squadron narrative reports - Squadrons 75 and 76.
http://naa12.naa.gov.au/SearchNRetri...spx?B=12265527 (For 10 April 1942*, see: pp.68-81 of 846).
* A summary of the claims:
Sgt M S Butler - ? - no claim
F/O J Piper - A29-23 'B' - 2 bombers damaged
P/O G C Atherton - A29-21 'K' - 1 bomber destroyed
P/O A D Tucker - A29-47 'R'1 bomber damaged
F/O M D Ellerton - A29-41 'M' - 1 bomber probably destroyed
F/Sgt R W Crawford - A29-26 'F' - 1 bomber damaged
2/No.75 Squadron scoreboard.
http://naa12.naa.gov.au/SearchNRetri...spx?B=30045889
I'll leave the rest up to you.
Col.