Fuse 104 controls solinoids 9 to 16 according to the print. Run the solinoids test function fit a good fuse installed and see when it blows. Sol 9 is left sling, 10 right sling, 11 bottom jet bumper, 12 Middle jet bumper, 13 top jet bumper, 14 trap door, 15 left up down gate and 16 right up down gate.  Run solinoids T 4 test in repeat mode that way you can slowly step through each soliniod till fuse blows

Shouldn't have anything to do with magnets at all