EDC overhauled, now throwing code 5FE7

[cheahcl]

Hey guys, need some help on the EDC
Sent to a shop to have it overhauled, and it developed a fault code. Helping the shop to trace the issue (translated from German):

5FE7 Rear axle valve fault
implausible signal or value
Test conditions not yet met
Error currently present and already saved
Failure would cause a warning lamp to light up
Error code: 5F E7 F8 05 28 1E AF 01 81 00 99 1E EC 00 EB 00
4A 1F 23 01 18 00 A3

We've tested the resistance of the damper motor and they are equal all around. What test was run during initial moving? Could it be wrong oil viscosity or slight over/under filling of oil?

Thanks alot!