Hoping for someone to verify if a p channel FET is on. The FET in question is enhancement type.

Measured voltages source +12.11
Gate. + 8.74
Drain. +0.03
I believe it to be on although defective, but not certain. Its used as a power side switch.

Type. Ao3407

The drain voltage is zero and the gate to source voltage is only -3.37V which is just slightly above the maximum specified gate threshold voltage of that part. The FET is probably not fully enhanced due to insufficient gate to source voltage. I'd try to bias the gate to source to at least -4.5V to get the specified 87mohm Rdson. FETs will usually fail short, not open, so it's unlikely that the part is bad.