As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RADOME TO FUSELAGE MOUNT AREA AT FS 30.00 HAD TO BE SEALED TO PREVENT PREMATURE RADAR FAILURES DUE TO MOISTURE. AS THE RADAR TRANSIT/RECEIVER IS HIGHLY SUSCEPTIBLE TO ANY WATER. WE HAVE HAD MULTIPLE FAILURES DUE TO THIS PROBLEM. THE REST OF FLEET WAS SEALED AND CHECKED PERIODICALLY FOR LEAKS. A FLEXIBLE BUTYL SEALANT WAS USED. (X)