There is a power transistor that has a heat sink attached on the component side. The flat pins at the insertion end are of different lengths. On the solder-side there is an inspection stamp and a piece of tape with "LKL" written on it. There is no extraction bracket, because there is a switch and potentiometers at the extraction end.
Printed in silver on solder-side of board
Handwritten in red on a sticker on the component side of the board