Thank you very much. I have continued my investigation and this is my actual state of K2000 about desoldered components: Q111, Q119, Q120, Q123, Q124, Q125, Q126, Q129, Q130, U123, VR109. Replaced U133 for new one. With all these components desoldered there is no excessive heat from any other components, except U139, which should be normal. Then I have measured Q101 and Q102 in circuit. Q101 has drain-source resistance > 60 MΩ, gate-source resistance about 773 kΩ, gate-drain resistance > 60 MΩ. Q102 has drain-source resistance about 3.69 MΩ, gate-source resistance776 kΩ, gate-drain resistance about 4.65 MΩ. From measured values my opinion is that they should be OK (from datasheet VDS breakdown voltage is 1500V). In this state (with desoldered components) I have performed built in self test which failed on error 100.1. I have expected this result with so many parts desoldered. From repair manual to this error there is sentence "The MUX word is applied to register U130 which sets lines A0, A1 and A2 of U163 high". I have measured lines A0, A1, A2 and they are really in high state (measured 5.032 V) so it seems that U130 works properly. Further measurements will be perfomed after the required parts will be delivered. Finally I have found one hidden blown part which is R283. Through this resistor, the AGND is connected throu 1.5 kV gas discharge tube and varistor to case which is probably connected to protective earth. Blown resistor is shown in the attached image.