What was found
AIRCRAFT WAS IN MAINTENANCE FOR TROUBLESHOOTING A NR 2 HEADING FAIL REPORT. THE NR 2 DIRECTIONAL GYRO WAS FOUND WITH VISIBLE SIGNS OF AN OVERHEATING EVENT. IT APPEARS TO HAVE ORIGINATED FROM AN INTERNAL PC BOARD. A CUT-OUT IS PROVIDED IN THE BASE ASSY OF THE UNIT FOR THE GYRO TO PROTRUDE THROUGH. A GAP REMAINS IN THIS AREA. SOOT WAS VISIBLE ON THE NOSE BULKHEAD WHERE THE RADAR MOUNTS. FUNCTIONAL TEST STICKER DATED 3/25/2009. SUBMISSION IS FOR BQVD. SUBMISSION PROBLEM CONTINUNUE. INSTALL WAS 5/27/2009 (351 HOURS SINCE INSTALL). NOTIFICATION PREVIOUSLY SENT.