What was found
AIRCRAFT WAS GROUNDED: BOTH ELEC AND ENG LOW PRESSURE LIGHTS ILLUMINATED AFTER GEAR RETRACTION ON TAKEOFF. EVENTUALLY ELECTRICAL LIGHT EXTINGUISHED BUTENGINE DRIVEN PUMP REMAINED ILLUMINATED. RAN QRH. A HYD SYSTEMQTY WAS 75% AND EVENTUALLY DOWN TO 66%. COORDINATED WITH MOC AND DISPATCH AND AGREED TO RETURN TO CLT. WHEN WE PUT THE GEAR DOWN TO LAND THE QTY WENT BACK UP TO NORMAL LEVELS. EMERGENCY DECLARED AND AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE REPLACED ENG 1 HYD PRESSURE LINE AND ENG 1 HYD EDP IAW AMM 29-11-11.