Technical schematics and wiring diagrams are typically detailed in comprehensive manuals, such as the WLX-896B Schematic Overview available on Schematic and Wiring Overview
This often points to a cold solder joint on the shunt resistors or a failing MCU pin. Wlx-896b Schematic
The WLX-896B typically runs on (for RD70HVF1 finals) or 48V DC (for LDMOS). The bias voltages are derived via linear regulators: Wlx-896b Schematic
I can give more specific troubleshooting steps if you have the unit open. Wlx-896b Schematic