I have a 2006 Phillips Magnavox 50ML6200D/37 and replaced the first lamp two months ago. Yes I used a Phillips OEM bulb.
From what I can tell, they are a temp and a lamp indicator.
I've unplugged it and let it set for several hours without help. When I pulled the lower cover I noticed that the exhaust fan was slowly turning instead of it's normal higher speed. The smaller fan appeared to be running at full speed. Being A PC support person, I swapped out a high speed 92MM case fan since the original has seized bearings. when I powered the TV back on, still had the same issue, so I swapped the original fan back.
the TV is a 2006 model, so it's 7 yrs old, but I'd like to keep it working even if it becomes a backup.