As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL340 AT 300 KIAS, DURING INITIAL DESCENT, ACFT ABRUPTLY NOSED DOWN. NOTICED GEAR AND FLAP INDICATION ON EDI, FLAPS SHOWED EXTEND TO 5 DEG AND RETURNED TO ZERO DISCONNECTED A/P. FLAP HANDLE NEVER MOVED FORM ZERO POSITION. REPLACED FAULTY LT FLAP POSITION TRANSMITTER IAW AMM 27-55-01. OPS CK GOOD SEE 214758/8 OVERSPEED INSP NOT REQUIRED. FLAPS NEVER MOVED. OK FOR SERVICE.