What was found
(CAN) DURING TAKEOFF ROLL, FLIGHT ATTENDANT WITNESSED A LOUD SCREECHING & POPPING SOUND FROM THE GALLEY COFFEE MAKER & WATER SPILLING ONTO THE FLOOR. THE FLIGHT ATTENDANT PUSHED EMER CALL BUTTON & CREW REJECTED TAKEOFF. MX TROUBLESHOOTING DETERMINED THAT THE POTABLE WATER PRESS REGULATOR PN 3E292-1 WAS AT FAULT. THE REGULATOR WAS REPLACED IAW APPLICABLE AMM REFERENCE & SYS CHECKED AS SERVICEABLE. AC HOURS 30803, AC CYCLES 15735.