As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TEN MINUTES INTO A TOUR FLIGHT, ENGINE BECAME MOMENTARILY ROUGH. UPON RETURNING TO THE HELIPAD, A MAG CHECK REVEALED THE RIGHT MAG WAS DEAD. UPON REMOVAL AND INSPECTION, FOUND MORE THAN HALF OF THE PLASTIC TEETH WERE MISSING (BROKEN OFF) OF THE LARGE DISTRIBUTOR GEAR.