Mark Levinson No23 repair help

I am having a problem with the soft start circuit not activating relay k300 to short out the three 10 ohm power resistors on startup. My suspicion is a shorted Q300.

My understanding of this circuit is when first powered by 20V DC transistor Q300 is fully on preventing current flow thru coil K300. As capacitor C316 charges, current flow thru Q300 decreases until it turns off after C316 has 20V across it (less emitter to base diode drop). At this point all current flows thru the coil, activating the relay. I am waiting for a replacement TIP125 to arrive before testing.