<<< Since I blew thru the small hose I now hear a whistling sound when the water is filling up. >>>
Turn off the hot & cold water spigots---remove both water hoses from the washer water valves.
Check the screens in the water valves---if "dirty"---clean any sediment from the screens with a small brush and rinse with a spray bottle (of water).
Test the washer with laundry a few loads.
It is not necessary to run *all* the diagnostics steps---a waste of diagnostic time/effort.
Water Level Sensors virtually never fail in the LG front load washers.
Keep focused on the possibility of a blocked air tube to the Water Level Sensor (test loads will determine).
If the "OE" error returns---next step is to measure voltage at the Drain Motor during *forced drain mode*---but---let's cross that bridge when we get to it---if we need to