15. Power of Court to modify award. -The Court may by order modify or correct an award-

(a) where it appears that a part of, the award is upon a matter not referred to arbitration and such part can be separated from the other part and does not affect the decision on the matter referred; or

(b) where the award is imperfect in form, or contains any obvious error which can be amended without affecting such decision; or

(c) where the award contains a clerical mistake or an error arising from an accidental slip or omission.