Sunsynk Fault Codes

I have a standalone 5kW SunSynk inverter installed at home, running from 8x 450W PV panels, Mains and 2x 5.5kWh batteries.

Last night, around 21h00 (pitch dark outside), F23 errors started.

The manual says it is 'AC leakage current is trans over current'.

Resolving it seems to be a check on the PV panels on the roof for possible earth faults (a connection could be wet I am assuming, or a cable has worn, resulting in an earth fault), or PV module and inverter cables.

Question: Can I check and resolve this myself, or should I get an electrician to help?

After switching off the PV-panel infeed trip-switch, and restarting the inverter the error did not come on again; however, now no charging via solar today).