Something similar here, the machine went to techinical service to address some issues with parts not being build correctly, optical window was cleaned and reassembled. Machine was operating correclty while on the technical service.
When we drive back at the office and placed the machine again on the place it sits, we power it up and the following message appeared, we get back with local support service but nothing worked( firmware update, reboots, moving the LPU manually etc)
