Product review (5 stars): Exact part replacement for WM1912CW LG Tromm
Purchased this to overcome the dreaded "dE" error when I tried to start a washer cycle.  Got tired of banging on the door/opening closing, pressing "start/stop" over and over to do a single load of laundry.  This is the exact part replacement for my LG Tromm WM1812CW.  So far, (with about 5 loads of laundry), I've not noticed any problems at all with the new part.  So that either means that I had a faulty Door Lock sensor, or something else was going on.  Either way, no issues with this part.

As someone mentioned, you can replace it by only unscrewing 6 screws total (4 for the top to slide the top of the washing machine off, and 2 that hold this part in place.  However, it's a pretty tight space to reach down into.  I'm 6'4 and didn't have any problems reaching the part to replace it, but it was fiddly to actually replace.  The cable connector was the hard part.  There's a small lever-lock on the connector, just make sure it's depressed before you start to separate the connector from the latch.  It's fiddly, and I had to wiggle it for a few minutes, but be persistent, and it does eventually unlatch without problems.  New part fit just fine, reinstalled, and no more "dE" errors.  So, bonus!

It _might_ be easier to replace with the LG tool that is sold separately, but it's probably not required.  As someone else said, un-doing the rubber gasket wasn't something I wanted to tackle.  That seems like something I wouldn't want to mess with on this kind of device.