What was found
(CAN) SECOND SELECTOR VALVE INSTALLED IN 14 DAYS. ON DI A SMALL AMOUNT OF FLUID NOTED ON CABIN FLOOR. INSPECTION OF OVERHEAD PANEL REVEALED A LOT OF HYDRAULIC FLUID HAD CONTAMINATED CENTRE LIGHT PANEL FROM STA. 111.0 TO STA. 332.0. HYDRAULIC PRESSURE PUT ON AIRCRAFT AND FLAP SELECTOR CYCLED TO FULL DOWN POSITION. AS SOON AS FLAPS STARTED DOWN HYDRAULIC FLUID STREAMED OUT OF THE LOWER RH POPPET VALVE COVER. COVER REMOVED AND NEW 'O' RINGS INSTALLED, BUT VALVE STILL LEAKED. VALVE REPLACED.