What was found
ON T/O FROM MSN, PLACED GEAR HANDLE TO UP, GEAR RETRACTED AND ALL LIGHTS EXTINGUSIHED NORMALLY, HOWEVER WHEN THE GEAR HANDLE WAS PLACED TO OFF, THE RED DOOR LIGHT ON FWD PANEL AND RT MAIN GEAR DOOR LIGHT ON S/O PANEL ILLUMINATED. REMOVED THE CANON PLUG FROM THE RT LANDING GEAR DOOR SWITCH AND FOUND THE PLUG DETERIORATED AND SATURATED WITH HYDRAULIC FLUID. REMOVED THE CANON PLUG AND CLEANED THE CONTACTS WITH CONTACT CLEANER INSTALLED THE NEW PLUG IAW THE B727-200 WDM 32-60-04-PLUG(D752).