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Check if T2 gets all SLPS2R and AWAKE required voltages; small coils around U7800.
Be sure to follow all the steps to put the machine into DFU.
You may need to force it manually.
https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)#DFU_Mode_using_Jumper_method
If no drop detected at 12V_S5, Q6970 should be good.
However, I recommend to change it, if you are not sure.
It should be available somewhere on Internet...