820-3437-B multiple sensor issues

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The problem:-

70% CPU usage when idle, machine slow, need to hold power button for power up, however, sometimes the system still fails to power.

ASD faulting sensors (IC0R, ID0R, IM3C, ISDC, PB1R, PC0R, PDTR, PPBR, PSDC, VC1C, VCS0, VP0R). Device takes 0.06MAh.

Issues found/fixed:-

PBUS_S0_VSENSE missing - Q5500 Pin 3 via severely corroded. Ran jumper to R5503 Pin 1 to restore, issues persist.

C5021 turned into 1Ω. Capacitor replaced, issues resolved, and ASD passed diagnostics.