Amend 5500 to reduce profit sharing contribution

We have a client with a safe harbor and cross tested profit sharing plan. They opted to maximize contributions for the owners. 5500 was filed and participant statements delivered. Now they do not have the money to fund the plan. Can they amend the profit sharing contribution and 5500 by still giving all the NHCE's the same contribution, but reducing the owners profit sharing to zero?

Filing a return and issuing participant statements does not make things final. Yes you can change the contribution and amend the return - if the plan allows for the type of contribution you are suggesting (everyone in their own group or at least owners in their own group).