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I started to feel very uneasy when reading there is other work taking place. It is possible your husband is stressed and has assumed that his testing on the CU installation is still valid, but in fact stuff has been changed after that either deliberately as accessories are replaced, or accidentally if a cable is damaged by other work.
The board looks untidy, as others have already said that might have been made far worse by some fault-finding already. I expect the customer's real issue is not believing it can be fixed properly. That is something your husband will have to address or give up and refund.
Really he needs to go back with plenty of time and systematically check all circuits, assuming nothing, and checking for the usual suspects for mysterious trips:
The board looks untidy, as others have already said that might have been made far worse by some fault-finding already. I expect the customer's real issue is not believing it can be fixed properly. That is something your husband will have to address or give up and refund.
Really he needs to go back with plenty of time and systematically check all circuits, assuming nothing, and checking for the usual suspects for mysterious trips:
- N-E faults (should be apparent on insulation testing)
- A "borrowed" neutral on up/down light circuits
- Faulty RCD (trip time & ramp testing should eliminate that)
- Faulty appliances being used (washing machines with water leaks, etc, but checking leakage in-use after all of the above should show this)