Land Rover LR3 Diff Lock Help

[diabetiktaco]

I've got the HDC fault and these codes:

• P080A-00 (7F) Clutch position is not learnt
  ( on 05-07-2022 18:19:23 at 154352 mi )
• P186D-00 (7F) Clutch actuator stuck
  ( on 05-07-2022 18:19:23 at 154352 mi )

ABS / DSC / Brake light is on. I went into GAP and set the vehicle to locking differential : not equipped. Cleared faults (these didn't budge). The TSB from Land Rover is nearly identical to my issues and pointing to a differential lock motor. I'm reluctant to buy one because theoretically the codes shouldn't come on if the clutch is stuck if the vehicle isn't equipped w/ a diff lock. I want the locker, but more important to me is special programs which are inoperable right now. Diff fluid is brand new with OEM fluid from Atlantic British and the battery is a brand new Interstate AGM with all normal voltages (14.4v). I'm stuck now.