It was one section (Trupp), not one company or one platoon (Zug)?1 section Pz Abw Abt 39
Probably this one company of the III./PR 5 was 6./Pz-Lehr-Rgt. (Schutzen-Kompanie 6.) which lost 12 - 18 KIA there.The total losses of the Group Ehlermann (II. /Reinforced SR 3, with 1 company of the III. /PR 5, 1 company of the II. /PR 6, 1 company Pi Btl 39, 1 battery of AR 75, 1 section Pz Abw Abt 39) were 154 men.
Thanks for this casualty figure from the battle of Sawin! This number (154 - I guess that both KIA and WIA ?) seems highly probable (if 1 rifle company lost 12 - 18 KIA, then the remaining few companies could have similar losses).
Btw - what's the source of this figure?