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Thank you for the explanation.
I already opened the PSU cover. Unfortunately it's a TDK600 PSU - and HV voltage at the two through-connections to Cincon CFB600 converter is 0V. So, also at 12V outlet there is no power.
I now have all tools for removing the battery, so I will hurry.
Is it possible to to test and repair LMU boards outside the battery (so I would dismount)? Where are the LMUs located?

I tried again without ignition short (orange/purple wires) and had various failures, but one time success and a full boot.
I was able to enter engineering screen. It seems, cells are defective - or is it a BMS module?

The bike was stored inside, so temperature was between 10 and 25 °C all the time. Sometimes I checked SoC and it always was 80% as expected...
I got a hint to feed 12V to the 2x2 Molex battery connector and then measure 9 V supply at Pin8 of 16Pin Molex battery connector: 1.2 V. Also 1,2 V at the glass fuse - fuse is intact.
When powered external, bike is booting for about 2 seconds and then breaks. So I can't get in the engineering screen to check SoC/SoH.
The lock is operating, when long pressing the power button (keyless go). The key isn't the issue - without I get the "Key not in range" message.
Would it be possible to feed 9 V external (e. g. at glass fuse holder) and try get a complete boot?

Key with new 2032 battery was placed direct at receiver. But actually all systems are down - no reaction to start button.

Unfortunately the bike was unplugged for several months (SoC was always "80%", when I checked...)
So, BMS should now be in cell protection mode and has deactivated uncharging.
It should be not too complicated to power the control board from outside - if you know, how?

I spoke to the dealer's technician - without Energica's online system they even can't get any access to maintenance manuals or tools... :-(

Does anybody have access to downloaded manuals?

My 2021 EGO was in LPR mode for several months - with red blinking LED in display and when powering from time to time, display did indicating 80% SOC...

Now LED is dark and I can't wake the bike by pressing the start button (keyless ride).
Does the BMS has a deep sleep mode? How can I reanimate it to initiate AC charging?
Or might the DC/DC converter cause the problem, as I saw in another thread?

Any advice is appreciated, thanks

Achim

Balancing starts when connecting to AC power, but stops after several minutes at 96% SOC.
So I have to do this again at a lower SOC?

@Aaron: Mileage is <5000 km 
Early Energica models had issues with battery defects, so it would be helpful to identify upcoming problems within warranty and contact manufacturer in time...
Achim