Edit Logs on KRC4

Hi, 1 month ago I have a situation at my work. Guys from integrators company used an arcweld robot. At the next day I was find a broken tool. I wanted to look Logs, but they was clear...no errors and warnings. Tool is mounted at the collision box. Hiting or crashing the tool would cause to triggering the collision box interrupt and writing at the logbook.
Is it possible to clean the log manually? How, is it possible? Thanks in advance.