DS3815PAAA is an Auxiliary Board and is part of the GE Speedtronic Mark IV gas turbine control systems for industrial and steam turbines. The auxiliary board was designed with an optional auxiliary board in mind (DS3815PABA.) A vertical male connector near the top edge of the DS3815PAAA connects the two boards. On the left and right borders of the board, there are two more PCB mating connectors. A 218A4553-1 A/mp 533002-1 connector is the first of them. A 218A4637P1 connection is the other. Three light-emitting diodes make up the board. One amber and two red LEDs are included.