What was found
(CAN) FOLLOWING AN FAA, SUSPECTED UNAPPROVED PART REPORT, FOR A COWL ANTI-ICE VALVE PN 300013000-002, SN 1596, THREE (3) ADDITIONAL VALVES WERE FOUND TO HAVE BEEN REPAIRED AND CERTIFIED WITHOUT THE USE OF PROPER CMM. THE VALVES INVOLVED ARE S/N: 133R, 867, 691.