What was found
DCA - FLT 2299 - AFTER T/O , AS THE LANDING GEAR RETRACTED, RECEIVED A RED LIGHT FOR THE RT MLG. THEN RECEIVED A RED LIGHT FOR THE A SYS HYDRAULIC. CONTINUED TO CLIMB TO FL190 THEN PERFORMED PROCEDURES FOR A SYS HYDRAULIC FAILURE. DECLARED AN EMERGENCY AND RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT MLG ACTUATOR PRESSURE LINE AND SPOILER B SYS RETURN LINE LEAKING AND CHAFED AGAINST ONE ANOTHER. REMOVED AND REPLACED HYDRAULIC LINES. REMOVED AND REPLACED THE A SYS ELECTRIC HYDRAULIC PUMP (P/N MPEV3-056-9A) AND NR 1 ENG DRIVEN HYDRAULIC PUMP (P/N 65075-06) AS PRECAUTION. SERVICED HYDRAULICS. OPS CHECK AND LEAK CHECK GOOD. (M)