As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O CREW SELECT FLAPS UP AND FLAPS STUCK AT 20 DEGREES. RAN QRH AND NO CHANGE SO FLIGHT RETURNED TO THE FIELD. THEY DID DECLARE AN EMERGENCY BUT NO TRUCKS ROLLED. MX C/W TO 22-050-004-09 IAW TO INSTRUCTIONS DETAILS ON FILE SUSPECT BAD LH BPSU REMOVE & REPLACE LH BPSU OPS CHECK GOOD AT THIS TIME