What was found
RT THRUST REVERSER ARM LIGHT ILLUMINATED IN FLIGHT ON LEG NR 2. A/C RETURNED TO BASE. GROUND OPS CHECK WAS PERFORMED, SYSTEM WAS OPERATING CORRECTLY IAW MM. VISUAL INSP REVEALED FOLLOWING: LATCHES WERE STICKY AND REQUIRED CLEANING AND LUBRICATION. T/R SYSTEM ACCUMULATOR HAD LOST ITS CHANGE. ACCUMULATOR WAS RESERVICED BUT LEAKED DOWN AGAIN IN A SHORT TIME. GAUGE USED TO CHECK ACCUMULATOR WAS ALSO STICKING AND PROVIDING A FALSE INDICATION OF CHARGE. ACCUMULATOR WAS REPLACED ALONG WITH THE INDICATOR GAUGE. LATCHES WERE CLEANED AND LUBRICATED. AS A FURTHER PRECAUTION THE T/R SELECTOR VALVES WERE REPLACED ALONG WITH SYSTEM RELIEF VALVE AND RIGHT SIDE T/R ACTUATOR. SYSTEM WAS RESERVICED AND OPS CHECKED.