I get it, but my advice: do what you gotta do. It's not like the warranty sticker's intact. Do as many mods to this thing as possible if you think it's on the brink.
I still can't believe people still use those fan speed xex's xD I run my xenon modded xbox at 100% with 2 50mm fans. and my jasper at 70%.
Well uh yeah how else would we get it cooled without ripping it open and doing some mod or the 12v mod.. Haha, at least the xexs are safe and can cool your unit without breaking your security seal?
well I would recommend replacing the thermal compound ASAP. Leaving the disintegrated garbage on there will kill your dev faster. Arctic silver works great. I had a xenon jtag that ran at 60 degrees when idling.. Thats pretty damn hot. After I cleaned the chips and the heatsink and added arctic silver 5 i was getting 35 degree temps when playing a FPS. After setting the fan speed to 100%.... Well the temps were in the 20's to say the least. Zephyrs are essentially a xenon with a hdmi port and a hana chip instead of the ANA chip.I doubt you need to replace your heatsinks, just the thermal paste will be sufficient.