Technical Ducato Transmission Faults

[BruneyC]

I have a red cog annd ann orange engine warning and stuck in limp mode with very clunky selection D/R/N on 9 speed automatic on 2020 Ducato.

OBD essentially shows two distinct faults:
P0895 Solenoid "E" Control Circuit Low &
P1DB2 Actuator Supply Voltage A Circuit

Question is,
1. do I replace transmission oil (no idea how) and try to reset error - then drive to commercial service agent for thorough diagnosis and repair?
2. reset error - then drive to commercial service agent for thorough diagnosis and repair?
3. Top up 250ml of transmission oil - reset error - then drive to commercial service agent for thorough diagnosis and repair?

Details:
Transmission Error

error code P0985.

What causes this problem with the Shift Solenoid "E" Control Circuit Low?

• Fault in the pressure control solenoid valve 'E'
• The harness of the Pressure control solenoid valve 'E' is open or shorted
• The circuit of the Pressure control solenoid valve 'E' has poor electrical connection
• Issue with the Engine Control Module (ECM)
• Low level of the automatic transmission fluid
• Dirty or contaminated auto transmission fluid

Make:FIAT

Code: P1DB2

Definition: Actuator Supply Voltage A Circuit

Description:

The voltage supply circuit(s) for the solenoids and pressure regulators are monitored for open circuits, shorts to ground, and shorts to voltage. If a failure is detected, the Transmission Control Module (TCM) will deactivate the affected power supply circuit and set a corresponding Diagnostic Trouble Code (DTC) relevant to the fault that was detected.

Cause:

• SOLENOID 1 SUPPLY CIRCUIT OPEN
• SOLENOID 1 SUPPLY CIRCUIT SHORTED TO GROUND
• SOLENOID 2 SUPPLY CIRCUIT OPEN
• SOLENOID 2 SUPPLY CIRCUIT SHORTED TO GROUND
• DOG CLUTCH A SOLENOID OR RELATED CONTROL CIRCUIT
• DOG CLUTCH F SOLENOID OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID LINE PRESSURE OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID TORQUE CONVERTER OR RELATED CONTROL CIRCUIT
• LIMP HOME MODE (Park by cable) or HYDRAULIC PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• HOLDING MAGNET PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID B OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID C OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID D OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID E OR RELATED CONTROL CIRCUIT
• TRANSMISSION CONTROL MODULE (TCM)