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Many chips connected there, not easy job.
Inspect U1900/50, U3740, U7001, U4650, U4850, U5110, J5250, J6100 for coorosion.
If nothing strange, then remove one by one and check diode mode reading each time.
Also take a look at filter caps placed on 3V42_G3H.
Unfortunately I don't get the green light and the fan doesn't turn Ppbus_g3 remains at 12.25 and pp3v42 3.37 pin 2 of l7095 I get: smc_bc_acok, smc_reset_l pp1v2_s5_smc, I checked the pull-up resistors and the crystal, is bad SMC ?