CT XPRESS/GX

Dear Friends,
I need your support on a Toshiba XPRESS / GX CT.
When I visited the site I got an error:
Overlong exposure time error in the XC
Contact service personnel
With details:
04 : E 0 : Error occurred in the high-voltage generator
09 : E64 : Low mA
24 : E 0 : XC error
27 : E 3 :Exposure timeout error
On XP board:
LED 5- “ON”: Name: LOWMA, Description: no current output from the anode is detected
LED 9- “ON”: Name: H_ERR, Description: A protection circuit is operating or control of XC is abnormal

I found out defective elements and replaced them
-F 28 / 100 A broken
-One IGBT in inverter part with broken collector / gate section. I replaced both IGBT and one Diode.
XC log did not helped.
The error is still present.
I have seen this error with a broken X-ray focus.
Further troubleshooting- Replacement of:
- XC board
- XP board
- X-ray tube
- HV transformer
- Check HV cables and other elements.
Error is still present no matter what action is taken.
The CT gives you the possibility to make an exposure- you can choose warming up or DCA scan- X-ray tube anode is accelerating, X-ray warning lamp is ON, start button is ON, but when you push the start button you hear the main contactor cut off the 290 V DC and no exposure is performed.
Obviously the problem is in HV generator.
I need support on HV generator protection circuits and interlocks.
Any new idea will be highly appreciated.
Thanks in advance