Yes DGS = Degause.
Reason to unplug is when checking current draw is the DGS is a dead
short when cold & can fool you. A normal set will draw @750 ma running.
Other thing to check is the @130 V. The little PS board has 2 transistors & a @1 ohm fusable. They all can blow from a shorted hoz output or FBT.
73 Zeno
LFOD !