Last thing I'll say, I swear! If it's ever been dropped(jarred) it's possible it'll be a bit out of sync. At that point, get a bottle of good liquor, an Opus A, and start a list of numbers tried.(do this only if the company has given you the combo and it DOESN'T work). It could be a number or two off either before or after one or more of the numbers. Yea, this would really suck! We had a customer have this happen and the company gave him an 8.5" x 11" sheet of paper with possible combos. Pretty funny (to e) since I wasn't;tt he one having to deal with it.
Again, good luck to ya!
Floyd T