What was found
AFTER TAKE OFF AT FLAPS 15/0, RETRACTED THE SLATS & THE SLATS RETRACTED BUT THE UPPER ZIPPER MOVED TO 255 KTS ON BOTH PFD'S. TRIED A RECYCLE BUT THE SAME RESULT. THE SFPI SHOWED THE SLATS UP & RECEIVED NO ECAMS. ON POST FLIGHT INSPECTION FOUND THE LG VMO/MMO SWITCH ON THE 90VU RACK TO BE IN THE LG DOWN POSITION. RESET SWITCH AND SAFTIED GUARD IN NORMAL POSITION AND PERFORMED TEST OF VMO/MMO OVERSPEED OPS TEST IAW AMM 34-10-00-05. OPS CHECKED GOOD. NO FAULTS INDICATED. PERFORMED AFS LAND TEST IAW 22-00-00-02, AFS LAND TESTED GOOD, OK FOR SERVICE.