I have a diagram for the K2000, so I gave the markings of the elements. The power supply is ok. Inputs through Q105,113,108 are blocked - the gates at the level of -15.78V.
The power supply for the U113 is 5.26V, which suggests a little bit. The VR107 and 108 diodes are marked "8A" which means they have 3.3V, which should give a difference of> 6V. When measuring -11.8V on pin 4 it is -14.4V.
EDIT
Since about 1.66mA can flow through R150 (25.5k) and there is 0.61V on R151, it means that the current is limited. 4mA then flows through R151 and R149 (150R). More or less, it means that 4-1.66 = 2.34mA is consumed by U113 (no voltage drop on R314 means no current consumption from U113 output). LTC1050 is supposed to take 1.5mA max. So I guess he is to blame for the large input current.