Looking at a Linde R20 S/N G1X113K01760 - 1999

Hydraulic valve solenoid for reach out function is becoming powered (and consequently opening spool for reach out) when hydraulic lever is pulled, irrespective of which lever is pulled. As a consequence the reach carriage wants to remain permanently reached out.

We've swapped the levers, remains the same.
Swapped the coils on the reach valve front to back, makes no difference.
Checked the valve block assembly and can't find fault.
Swapped the outlet pipes to reach cylinder and the fault reverses (i.e. will want to reach in all the time).
Swapped the Hydraulic Control module, remains the same.
All wiring looks in good order with no signs of chafing or damage.
Only fault codes showing are 2, 3 & 9 which all disappear when drive engaged.

Anybody got any ideas, anybody come across this before ?

Any help would be greatly appreciated.