Kilwhang #3014,
That must have smelled like a paraffin cooked toffee apple on shut down. Amazing that the little buggers can be so active in only a couple of days. I assume, as you suggest that the GE removed the intake blanks, that the little devils entered the engine via the jet pipe. In my day as a GE, some while after your experience, we were advised that if staying on the ground for more than the usual night stop, it was advisable to fit tailpipe and NACA duct blanks too. Perhaps as a result of your experience.
Smudge