The teardown of the tool reveals a single-board RF layout. The failing is mapped to an open 1-Ohm resistor which feeds the power supply of the divider panel IC feeding the PFD of the PLL. A ceramic capacitor failing is additionally observed which might describe the damages to the 1-Ohm resistor.
In this episode Shahriar examines an unsuccessful R&S FSL Spectrum Analyzer. The tool reveals an uncommon range trace and also stops working a vast array of self-test features. The LO Unlock failing is most likely one of the most crucial thing to address which can trigger a waterfall failing of various other features.