Sedecal global showing E22

Yes its showing tube 2 but unable to select tube 1. How we can reset this as this comes on as soon as we start

DESCRIPTION : Wrong Tube-2 selection.
ERROR TYPE : Informative. Does not allow operation until the error is solved or another Tube is selected.
APPLICABLE TO : All Generators.
APPEARS WHEN : At any moment mainly after initialization or when changing Tube selection.
INFORMATION / SYMPTOM : Wrong Tube 2 selection.

POSSIBLE CAUSES
The –HT INTLK is not at high logic level 5V (Tube 2 selected).
Defective HV Switch inside the HV Transformer (two Tubes option).
The --HT INTLK is grounding.

ACTIONS
Note: Before performing any action, check the Workstation configuration for each Tube.
Only for one (1) Tube option:
1. Check the –HT INTLK in 6J3-13 (Generator Cabinet), it should be 5 VDC with Tube 2 selected.
2. If it is not 5 VDC, check that 6J3-13 is not grounding.
3. If 6J3-13 = 5 VDC, check J3--13 on the ATP Console CPU Board.
4. If not 5 VDC in J3-13, disconnect J3--13 on the ATP Console CPU Board and check for
short--circuits between J3--13 and ground or others signals.
5. If voltage is 5 VDC and “E22” appears, replace the ATP Console CPU Board.
Only for two (2) Tubes option:
1. Check J3-13 on the ATP Console CPU Board. If it is 5 VDC, replace the ATP Console CPU
Board. If it is 0 VDC, proceed to the second step.
2. Turn off the equipment, disconnect J1 from the HV Transformer and check for short--circuits
between J1--J and ground or others signals.
3. If previous steps are correct, replace the HV Transformer.