Apologies in advance for not searching through the 1700+ posts 'cheap drives' thread.
My current 3 axis system is now a 2 axis system

A bit of uneducated postmortem suggests the failure was my fault. A chip probably bridged a couple of the motor leads. The design of this drive is 'all-in-one' so it will be put to use in a lathe project with the remaining 2 axis.
If an individual axis fails on the G540 is the repair usually as simple as installing a new G250? If so, is this easily done by an unskilled customer?
Is a short in the motor cabling certain death for any stepper drive? Is the G540 less prone to this type of failure?
Do you attempt any repairs on returned units or is the policy to simply replace? Sorry to be talking failure pre-purchase but these are things I didn't consider before buying my current drive.