I found it. I went to: service.haieramerica.com and there you can scroll down, and some (but not all) models have service manuals for download (not just user manuals, but full service manuals).
The LE24C1380 has its manual online.
On Page 43 of the manual, it says how to get to the Service menu:
From the remote:
TURN ON TV
PRESS 'MENU'
PRESS NUMBER KEYS: 1, 9, 9, 9
PRESS ENTER
And you'll get to the service menu.
Hope this helps others with this model (or other Haier Models)