As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 001 - KOAK-KSMF - WHILE EN ROUTE TO KSMF HORIZONTAL STAB JAMMED. CREW ADVISED TO RETURN TO KOAK. AIRCRAFT RETURNED TO KOAK. MAINTENANCE FOUND SHEAR RIVETS ON UPPER SPROCKET SHEARED. REMOVED AND REPLACED HORIZONTAL STAB SPROCKET ASSEMBLY IAW MM 27-42-09. OPS CHECK GOOD. NO LEAKS NOTED. (M)