[Rules] Crab flail tanks - damage check?

[broadsword]

I'm traveling and left my scenario booklet at home, which has the rest of this rule. Can anyone help me?

Crab tanks can do mine clearance. They enter a mined hex, and at the end of every third turn they stay in the hex, one mine point is removed and the player checks for possible damage to the tanks (as a result of the exploding mines wearing out the flail roller mechanism).

What are the 1D6 die roll results to get damage/no damage?

Is a damage result a step loss, or just that the unit can't clear mines anymore?