As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLEMENTAL INFORMATION: THE MECHANIC WAS COMPLYING WITH QAN 12-09 CONCERNING THE INTRODUCTION OF TECHNICAL FAX 09-006 REGARDING THE EC-135 ROTOR MAST NUT TORQUE CHECK. THE MECHANIC FOUND THAT THE MAST NUT BACKED OFF BY HAND WHEN INITIATING THE TORQUE CHECK. HE THEN TORQUED THE MAST NUT AND RETURNED THE ACFT TO SERVICE.