What was found
AFTER TAKEOFF, NOISE CAME FROM FO SIDE, SIDE CONSOLE MUCH LIKE RELAY CHATTER WHICH INTENSIFIED. UPON RETURN TO LAND THE RELAY CHATTER QUIT AS REDUCED POWER FOR DESCENT, WINDSHIELD HEAT APPEARED TO WORK NORMALLY WITH CORRECT INDICATION WITH SWITCH POSITION. TROUBLESHOT SYSTEM, FOUND LOOSE CANNON PLUG ON GREEN SYSTEM HYDRAULIC PRESSURE SWITCH, WAS ABLE TO DUPLICATE PROBLEM. TIGHTENED AND CLEANED CANNON PLUG, OPS CHECKS GOOD AT THIS TIME.