Figuring out leak on left bank.

So I have been having a pretty bas leak on the bottom side of my left bank. it looks like it could be coming from the AVCS solenoid, valve cover gasket, spark plugs, pvc hose( near the steering Colum, or cam seals. I honestly have no clue other than the fact it looks like fresh oil is on the AVCS and already put leak tracing powder on the left bank. just need second opinion. Also if any info on common leaks near the oil return line on the oil pan would be much appreciated too. Thank you for the help to anyone who answers