As its open you have a chance.
Its possible with many combination locks to "feel" the wheel "drop", if you have a light touch. Once you have the old combination dialed in you just flick the little lever inside, dial in a new one (write it down) & you're done.
If you don't have/cant acquire "the knack" a locksmith can either do it for you, or replace the locks with new ones.
Option 3, contact the maker & buy new locks & install them yourself, they are surprisingly cheap.
