During my annual inspection I caught a broken bracket under the ignition module. I caught it by chance just because the vibration had created a polished crack that reflected my torch light. Very tight place, no easy access for repair and after finding how this bracket was made originally by Rotax (by bending 90 deg a pretty thick piece of Al), I decided to fabricate one (out of an Al angle) that should be less likely to crack. I suspect that I missed this broken bracket at my last annual because it was not polished enough...
Here is the faulty bracket with the new one I fabricated:
Here is the location where the bracket can be inspected (the new bracket shown here after repair):
You can easily understand why this cracked bracket might be difficult to detect (although I found afterward that pulling the ignition module up will show the crack once the bracket is broken)