Here is the reply from Elektron support:
Hi Nicolas,
Our workshop do not believe it’s the battery but if you have the skill to
open the machine you can check the connectors between the CPU board, the UI
board and the PSU board.
Otherwise I think our workshop will have to take a look at the machine. I
paste the costs for a repair below.
The cost for a repair is 35 EUR / 45 USD per every started 30 minutes.
Spare parts and shipping is not included in this price and VAT is not
included where applicable. Its highly unusual repairs exceeds 1 hour.
Turnaround for repairs are 2-4 weeks after we receive the unit.
Regards,
Olle
Is opening the machinedrum really hard stuff to do?