Yes, looks like the 51 MTAP KBF has lost 3 A-20 Bostons to III/JG 51 fighters on September 22, 1944 indeed. (Zhilenkov's, Baranov's, Permyakov's crews - 9 KIA) Their total loss that day was 5 Bostons!
http://www.bellabs.ru/51/Morozov/Losses.html
Gabor