[Elecraft] KAT100 stopped working

[Hans Bonnesen]

After two years of flawless function my combo-installation ( k2 + KAT100) stopped working.
The friendly chatter of relays when pressing the tune button went silent, and the line of small lamps on the front of the KAT100 went up all the way in RED.
while the display showed ( excessive power)Iswithed off the set entirely to prevent a burn out of the PA-transistors.
Furtheer investigation showed that these were unharmed, but apparently the relays of the automatic tuner do not work anymore.
What went wrong here, and how to remedy?

Kindest greetings

OZ5RB
Hans BONNESEN
25 Birkebakken
3460 Birkerød
Danmark