Relay often cannot be reset Lisec insulating glass

Troubleshoot a recurring fault on a Lisec insulating glass machine where relay K30a trips and cannot be reset. Photo 1 shows relay K30a, part number 55.339.024.0000, in a tripped state, indicated by the illuminated red LED. The company suspects an electrical issue. Photo 2 shows the PLC, with outputs present, suggesting the issue is downstream of the PLC. The mission requires electrical troubleshooting and relay logic skills. The machine is available from August 16 to August 20, 2026. Plan for 24 hours of work to diagnose and resolve the fault.