an E-pl1....cheap right now. I don't think anyone have ever seen red dots in an E-pl1. I am also suspicious if this is an effect of the Mark II kit lens? Has anyone ever seen red dots on an E-pl2 using the Mark I lens, or any other lens for that matter?
Addiing to Alexsfo's input, I've reproduced it with all my lenses (including various legacy).
Since the sensor hasn't changed since the E-P1, the thickness or strength of the filters covering the sensor may have been modified. Or, the coatings on them have been modified. I'm not sure if the microlenses can be modified without creating a new sensor. But something is different that allows strong reflections from the microlenses or photosite wells in this particular model, that uses that same sensor.
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...Bob, NYC
'Well, sometimes the magic works. . . Sometimes, it doesn't.' - Little Big Man
http://www.bobtullis.com