I thought Prince clearly stated he wrote up the exceedence in the log and even filed an ASR!
sheesh!
What I believe he was advised by his LIP friend that no maintenance action required for Vmo exceedence less than 20 kts. The maintenance will access the QAR to ascertain that the exceedence is within limits after the mechanic had read the flight/maintenance log report. If it is less than 20 kts, no action required and the aircraft goes back into service without further ado. If the exceedence is above 20 kts, then physical and diagnostic maintence actions are required.
How did the 20 kts thingy came about? I believe it is in the maintenance manual and that individual knew about it as he had done many maintenance acceptance and delivery acceptance flights before, whereby the Boeing factory pilots and engineers had advised him so.