What was found
DURING CRUISE AT FL410, OBSERVED THE AMBER LEFT LOW HYDRAULIC ANNUNCIATOR FLICKER FOLLOWED BY THE RIGHT. FLICKERED AGAIN A FEW TIMES THEN TURNED SOLID ON. THE HYDRAULIC PRESSURE GAUGE SHOWED NORMAL 1550 PSI. DETERMINED THAT THE HYDRAULIC PRESSURE GAUGE WAS VERY, VERY SLOWLY GOING DOWN MAYBE 50 PSI. DIVERTED DUE TO A HYDRAULIC ISSUE AND DECLARED AN EMERGENCY. LANDED WITHOUT INCIDENT. MAINTENANCE DISCOVERED HYDRAULIC LEAK AT THE RIGHT LOW PRESSURE SWITCH. THE PRESSURE SWITCH PACKING WAS REPLACED. SYSTEM VERIFIED NOT TO BE CONTAMINATED. ENGINE DRIVEN HYDRAULIC PUMPS REPLACED. SYSTEM OPS AND LEAK CHECKS PERFORMED. AIRCRAFT RETURNED TO SERVICE.