Twizy 80 (2013) – persistent cluster DTC 2/83, SERV light on – what does it mean?

Hi all,

I just installed a new OVMS v3.3 (OVMS-33-7600G) in my Twizy 80 from 2013. The SERV warning light on the dashboard is permanently on (was on also before installing OVMS)

- SEVCON: "Gen4 (Renault Twizy) 11 November 2011", so not tuning-locked
- Odometer 17,789 km, SOH 78%, BMS type 7 (standard), BMS error 0
- 12V: 14.3 V with the car on, no 12V/battery/temp alerts

Original DTC report (xrt dtc show):
#01: 2/83 rev0 PRESENT G1 MEM @ 15601km 0kph SOC=68% BV=14V IC=255
#02: 2/65 rev0 G1 MEM Ef DNS @ 15627km SOC=99% BV=14V IC=255
#03: 4/20 rev0 G1 INT MEM Ef @ 16599km 3kph SOC=69% BV=13V IC=255
#04: 3/1 rev0 G1 MEM @ 17193km SOC=41% BV=13V IC=200
#05: 4/1 rev0 G1 MEM @ 17193km SOC=41% BV=12V IC=200
#06: 1/37 rev0 G1 INT MEM Ef @ 17193km SOC=41% BV=12V IC=200

SEVCON log (xrt cfg showlogs) had one alert:
0x4f01 Severe | Unexpected slave state | CANopen slave has changed to unexpected state
co.can1.nd1.emcy.code = 33280 (0x8200), type 16

Test:
1. xrt dtc clear + xrt dtc reset + xrt cfg clearlogs
2. Power cycle
3. Result: only 2/83 came back immediately (PRESENT, IC=1, 17789km). All other DTCs stayed gone, and the SEVCON log stays empty. SERV is still on.

Questions:
1. What does cluster DTC 2/83 mean? (I can't access the DF code list on twizy-forum.de yet.)
2. Is it a known cause of a permanent SERV light, and what's the usual fix?
3. Is it safe to try SEVCON tuning profiles while this DTC is active, or should I fix it first?

Thanks!