What was found
CAPTAINS NAV DISPLAY, LOWER DU & BOTH FIRST OFFICER DISPLAYS FAILED INTERMITTENTLY. ADDITIONALLY FIRST OFFICERS RADAR FAILED & DISPLAY SOURCE LIGHT ILLUMINATED, INTERMITTENTLY. REPLACED BOTH DU`S IAW AMM 31-62-21-000-801 & 31-62-21-400-801. INDICATION ALL NORMAL & NO FAULT FOUND. ROTABLE PARTS CHANGE WAS INDICATED TT 1835294, SN OFF 00187, TT 1821296, SN OFF 01795 IPC REFERENCE NR UNIT, DISPLAY OFF 29-3162-9-0002 1795 ON 29-3162-9-0002 2519, ROTABLE PARTS CHANGE WAS INDICATED TT 1835294, SN OFF 02727 UNIT, DISPLAY OFF 29-3162-9-0002 2727 ON 29-3162-9-0002 1788.