How can I troubleshoot a Kobelco error code 10058?

Start by visually inspecting the CAN bus wiring and connectors for damage or corrosion. Use a multimeter to check the continuity of the CAN high and CAN low lines. Verify the power supply to both the MCU and HPCU. Finally, consider testing the CAN transceiver functionality or replacing the HPCU if other checks fail.