I had similar vintage Levinson gear and happened to find my manual for the 360s dac. Pressing the Standby button on the transport should bring all components out of standby. When fully on pressing the preamp's Standby button should put everybody to sleep. It also mentioned pressing Stop on the transport to complete the initial Linking setup.
I would look at the cable and connection port on your 336 amp to determine if they are OK.
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System: ML:5206,5302 Serafino's Nordost Lumin U1 RM15
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