2005 Outback P0171 DTC Code, Lean Bank 1

[bobinyelm]

B1 Short Term Fuel Trim 35%

B1 Long Term Fuel Trim  -3.9%

Bank 1 Too lean (P0171)

I'm guessing a large unmetered  intake air leak, but Live Data shows NO reference to Bank 2 at all on my Scanner (Autel MaxiDAS 708), and

I don't HEAR an air leak between the intake air plenum and the Right Side Head Ports, and shooting Flammable Brake Cleaner around don't indicate a leak.

No Misfires but slightly unsmooth idle.

Curious WHY does the Live Data not even list Bank 2 PID?

Any suggestions welcome!

Thanks!

Bob