Zorbos (from Tomb of Annihilation, p. 41) have the following Destructive Claws attack (emphasis mine):
Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 8 (2d6+1) slashing damage, and if the target is a creature wearing armor, carrying a shield, or in possession of a magic item that improves its AC, it must make a DC 11 Dexterity saving throw. On a failed save, one such item worn or carried by the creature (the targets choice), magically deteriorates, taking a permanent and cumulative -1 penalty to the AC it offers, and the zorbo gains a +1 bonus to AC until the start of its next turn. Armor reduced to an AC of 10 or a shield or magic item that drops to a 0 AC increase is destroyed.
Is it possible to repair a magical piece of equipment (+X armor, +X shield, ring of protection, etc.) that has been damaged by the zorbo's Destructive Claws attack?