915is - Acceptable abnormal operation

In flight I had HIC A (Warning light line A) turning on. After a short while HIC B also turned on (both constant light).

I get the following message from Rotax technician from Rotax Poland:

” Engine checked.There is only one type of fault: magnetos.This problem is common with the Rotax engine but there is no solution yet from Rotax.There will probably be a service bulletin in the future”

Now he wants me to ignore the failure and continue flight. No need to say it is absurd, but where do I go from here? Is the aircraft grounded until a solution is found (!)

The engine is about a year and has around  100 hours