Tech log entry for this type of event could be applicable. Typical result might be "ground checked, no fault found, Further report please". The writer of the original report will need to respond again if the problem remains. Other crews will see the continuing fault(?) but no need to write it up as the originator seems to be persistent. After a few months originator starts to think its his imagination as no-one else is reporting.
Unreported matters and those that are difficult to diagnose, can still be significant, and there is an example of loss of aircraft from non reporting. In a case that I know of, a persistent lone voice prevented an almost certain loss.