Blowing F^ time delay fuse in a 2000LE M7

We starting haveing trouble with our Spa after a year of runining it . It keeps blowing the F6 time delay fuse , Its in a 2000 LE M7 Control unit Balboa , It all so trips the GFI at the same time . Now , I did take the # 1 Pump and have it tested at the local electric motor shop but from past experience with electric motors that dont mean anything because it wasnt hooked up to the spa then . And also replace the heater element thought it might be that but it ran a week and did the same thing again , Terry

First you want to turn off power to spa and replace the system fuse. Then disconnect the blower and all pumps. Then power back up, if the fuse still blows then check for cracked or damaged wires. If it doesn't blow then power back down and connect the pump one at a time as well as the blower and power back up with just one component connected until you determine which component is causing the fuse to blow.