how to easily fix stuff like this by downloading the world once:Thank God! People crashing the server every day with a gas combine in pipes, speed upgrades in a separator, etc gets annoying really fast... Especially when you have to constantly download and upload a 10gb world file back and forth for MCEdit.
Download the world and make a copy(as the world will keep expanding and this way if you end up totally breaking it you don't have to download it again).
next time a crash happens and you know the chunk or coordinates use this to find the region file
download the region file and place it in the correct place on your local world
fix the region using mcedit
upload region file to the server