As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PATIENT TRANSPORT, THE PILOT RECEIVED A LOS NR TACH INDICATION OF 320 RPM. THE NR WARNING HORN NEVER ACTIVATED. THE HELICOPTER MADE A PRECAUTIONARY LANDING. THE PATIENT WAS GROUND TRANSPORTED TO HOSPITAL. MAINTENANCE WAS DISPATCH. THE HELICOPTER WAS TROUBLESHOT AND THE DUAL TACHOMETER INDICATOR PN 61476-403-1 WAS REPLACED WITH A NEW INDICATOR. (K)