There's a coolant leak on the front of the engine that appears to originate from somewhere around the supercharger area and runs all the way down the front to the oil pan. The highest point I can see with coolant is on the supercharger inlet tube.

I've already replaced the water pump o-ring and flange that attaches to the block and it's o-ring.

By the time I pull everything off to get to that area, coolant has already spilled on most everything in that area, so hunting down the leak is pretty difficult. I've put it in service mode twice attempting to find the source and once the hoses are off they spill everywhere. It will leak after about a 20 minute trip, maybe 1/4 cup of coolant lost.

Any suggestions on the possible culprit for a leak dripping down the SC inlet tube?

 

Not what you want to hear you replaced the o rings, but it could very well be the water pump itself. Mine was leaking out of the weep hole on the pump itself. A new pump fixed it.

 

Most likely culprit will be the water pump, but there is also a coolant block off on the W11 engines where the coolant pump on the W10 Cooper engines is located that can leak located behind the SC.

But chances are that your issue is the water pump.

We have everything you may need to do the job:
Water pump

Block off plate O-ring

A pressure bleeder will also help to diagnose where the leak is originating from without the car being heat cycled.