As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HUMMING NOISE INFLIGHT WITH FLAPS IN UP POSITION, NOISE GOES AWAY WITH FLAPS DEPLOYED. REMOVED AND REPLACED PCA AND COMPLIED WITH LEFT INBOARD FLAP SEAL PLATE MOD IAW EMB AMM 27-12-01. OPERATIONAL CHECKED GOOD WITH NO DEFECTS NOTED, RETURNED AIRCRAFT TO SERVICE.