This Camera config will work in the the 900 and 900ER versions
This Camera Conig is for the PMDG 737-900 install to the following locations
username/appdata/local/packages/Microsoft.FlightSimulator_8wekyb3d8bbwe/localcache/simobjects/airplanes/PMDG 737-900
username/appdata/local/packages/Microsoft.FlightSimulator_8wekyb3d8bbwe/localcache/simobjects/airplanes/PMDG 737-900ER
Use ALT+ numbers 1-0 to view (see pics)
Enjoy
Just a note, for Steam installs, the path is:
C:\Users\[USER]\AppData\Roaming\Microsoft Flight Simulator\SimObjects\Airplanes\PMDG 737-900
C:\Users\[USER]\AppData\Roaming\Microsoft Flight Simulator\SimObjects\Airplanes\PMDG 737-900ER