I have an aged (15 yo) Sun server sitting in an airconditioned room, whirring away. Had to replace a fan last week and on opening the case found the acoustic(?) foam inside the case appeared to breaking down/melting in places and had deposited a blob of tar like substance onto some wires.
I've new come across anything like this before, wondered if anyone else had ? Would be very happy to know that it's nothing to worry about as it's likely to die properly if we try to relocate the hardware into a replacement case.