Markoz wrote on Jul 17^th, 2012 at 1:48pm:

Raven wrote on Jul 17th, 2012 at 3:35am: Actually you don't need to edit MDL. 757 uses "fx_strobe" effect. So try to edit it. I thought there needed to be a line in the aircraft.cfg to say the strobes were using the "fx_strobe" effect. But if I'm wrong, I'm wrong. Sorry about that.

You're right there should be strobe lines in aircraft.cfg, but there are not. And you're  right once again saying the lights are in MDL file.  Just open it with ModelConverterX and you'll see.