“4 of the 6 cannons had breech-blocks that could not properly lock, meaning that firing could result in misfires that would kill soldiers manning the gun. On all the cannons, old hydraulic fluid had been recycled, which threatened further malfunctions.”
https://defenseone.com/threats/2023/05/army-sent-vehicles-rotted-tires-and-misfiring-cannons-ukraine-watchdog-finds/386959/…