You use the quantum tanks thought don't you? As far as I know they use pretty much the same coding but store liquid instead of items..
But the coordinates don't match up so can count them out. Also further investigation shows that 90% of gregteech blocks use part of the quantum chest code. Pretty sure automatic assembler(most likely one) is the culprit or industrial electroliser as they are the blocks I was working on.
Eidt worked it out in creative mod the block is actually an ME controller causing the problem . This would be right looking at the coords.
The actual bug is caused by placing an ME storage bus on gregtech blocks but removing the controller will work (tested multiple times same result crash).
in other words dont use me storage on gregtech blocks or = crash I was trying to add to assembly machine
3 way I think best way to resolve this are
1. restore backup
2. remove Asssembly machine
3. Remove ME controller
From the wiki
Combining a Storage bus with a GregTech Industrial Electrolyzer, Assembling Machine, or Quantum Chest will cause a recurring and unavoidable error in either single-player or multi-player, grinding the server to a halt when the error first happens, disconnecting everybody. Upon reboot, it will continue doing this whenever the chunk with the offended item is loaded. Possible fixes to this bug I have explored - after ensuring to start off with a full world backup of the problem world in case you mess it up further):
BEST: Restoring a recent backup, if you make regular back-ups.
ALSO GOOD: Edit the world file using MCedit to remove the Industrial Electrolyzer,
Assembling Machine , or Quantum Chest or ME controller
BAD, BUT NOT SO BAD: Changing the GregTech Machine ID in the GT Server Config Files and then changing my client's configs to match, then starting the server and connecting. This will unload the machine causing the problem. It would also be possible to do a similar thing with Applied Energistics via the config (though I'm not aware of the Item ID to try there.) You will have to replace both your items and items any of your users lost during the unload of either mod, though if there aren't a lot of chunkloaders, the damage could be minimal.
WORST: You could also temporarily remove the mods outright, start the server/game, allow time for the items to register as disappeared, then stop the server and reinstall them. Keep in mind that this option will destroy machines, ores, and items in inventories if they happen to be loaded in time.
WILD CARD: A final option would be to, after first making a world back-up and figuring out the chunk's region file with one the available online calculators, to then delete the offending region file where this happened. This deletes a 512x512 area of your world and resets it to its original state. Generally ill advised unless you somehow know that whole chunk is junk, anyhow.