What was found
WHEN LANDING GEAR WAS SELECTED DOWN, GEAR NEVER MOVED. EMERGENCY GEAR EXTENSION WORKED PROPERLY, BUT ALL FLUID WAS GONE WHEN THIRD GREEN LIGHT CAME ON. FOUND DOOR CLOSE 'AN' FITTING HAD BROKEN AND DUMPED FLUID WHEN GEAR COMPLETED UP CYCLE. PIPER PARTS LIST SHOWS AN ALUMINUM FITTING. TT ON ACFT, 7,151.7 HRS. TIME ON ACTUAL FITTING IS UNKNOWN. FITTING BREAK LOOKED LIKE COMPLETE FAILURE SUDDENLY - NO PRIOR CRACK PATTERN SHOWN. GEAR WORKED NORMALLY AFTER FITTING REPLACED AND FLUID REPLENISHED.