Vaccum light yellow, +/-300 and +/-150 power supply unable to turn on

Hello everyone, I am having a vacuum issue with my LTQ XL: the vacuum light is yellow, the ±300 V and ±150 V power supplies will not turn on, and although the turbo pump runs it stays around 800 Hz and does not ramp up; I tested the power supply separately with external voltage and all indicator lights came on, but once reinstalled in the instrument it will not power up, so I am unsure whether this is a vacuum interlock problem, a control/PCB issue, or something else, and I would appreciate any advice on what to check next.

Equipment: LTQ XL