As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, WITH GEAR RETRACTED, WHEN WE WENT FROM FLAPS 5 TO FLAPS 2 GOT THE TAKEOFF WARNING HORN, WOULD ONLY EXTINGUISH BY REDUCING POWER. ALSO GOT THE HORN WHEN WE WENT FROM FLAPS 25 TO FLAPS 30 AT LANDING. R & R MLG ACCESSORY UNIT IAW MM 32-09-121-4 AND TESTED NORMALLY IAW MM 32-09-121-5. PERFORMED MLG MODULE ADJ/TEST MIN CHECKED OK IAW MM 32-09-122-5. ACCOMPLISHED NORMAL T/O WARNING SYS TESTS IAW MM 31-26-000-5. SUBSEQUENT TESTS NORM. VERIFIED WIRING OK TO SENSORS. RESISTANCES THRU THE SENSORS MATCH.