Hk:Hofner, Albert opravuje motor mlátičky
viz svědectví
On Tuesday, April 4, at around 9 a.m., the mechanic who had been booked with Andreas Gruber to repair the engine of the thresher arrived in Hinterkaifeck. He was surprised to find that in the 5.5 hours he had spent there he had only noticed domestic animals. He did not search for the cause and when he had finished his work, he left at around 14:30 hrs.