Posting some (exact) voltages from the board.
Like 3V3_S5/SUS and PPBUS_G3H.
Good if you post more...
your issue is ppbus it should not be 8.2 but rather 8.6. Smc_reset_l voltage? This is looking like a bad smc to me. Post that voltage first
If you get orange light, SMC_RESET_L should be good.
3V3_S5 present also means SMC_PM_G2_EN is OK.
I asked about 3V3_SUS and no response.
If miss it and also PM_SLP_SUS_L, then check all (4) RTC signals from page 12.
Is PPBUS 8.2 or 8.6? If 8.2, you have a bad SMC.