What was found
CTR HYD PRESS LIGHT ON, EICAS "C HYD DEM PUMP" MSSG W/ SWITCH IN "ON" POS. AS PER VERBAL WITH ARRIVING CREW. EICAS C-HYD DEM PUMP DURING GEAR AND FLAP RETRACTION. LIGHT EXTINGUISHED AFTER RETRACTION. CHECKED ADP. OPS NORMAL ON GROUND. REMOVED ADP, AND HUNG NEW ADP IN POSITION. TROUBLESHOT TO BAD ADP FROM STOCK, REPLACED ADP AGAIN. ADP OPERATION NORMAL WITH THE EXCEPTION OF A LEAK, 60 DROP PER MIN, AT THE PUMP FLANGE. REPLACED HYD SYS ADP. SYS OPS NORMAL.