DS200TCPDG1B is a Power Distribution Board and is part of the GE Speedtronic Mark V gas turbine control. There are eight toggle switches, 36 fuses, and four signal wire connections on this unit. There are also 36 OK LEDs and a 10-pin connector on it. The operator cannot see the state of the fuse since the fuse housings are dark plastic. A simple glance at the OK LEDs, on the other hand, provides all of the required information. Each fuse has a unique identifier. The ID begins with FU and is followed by a number. One fuse holder, for example, has the ID FU1, another has the ID FU2, and yet another has the ID FU3.