Hi, a customer of mine has a Neff B1422N0GB/03. After she cleaned it at the weekend, the oven is now tripping when the thermostat switch is activated. I assumed it was going to be an element issue, so I replaced the ring element. This did not fix the issue, so I carried out checks on the grill element, fan motor etc, which all seem fine.
some things are more common to do this, elements as your said first, have had a fan motor do it. lampholders tend to go live to neutral so its less likely unless its been comtaminated when cleaning
are you getting any readings to earth with your meter. ?