At the end of 2018, internal auditors discovered that PKE Displays, Inc., had debited an expense account for the $380,000 cost of a machine purchased on January 1, 2015. The machines useful life was expected to be five years with no residual value. Straight-line depreciation is used by PKE. Ignoring income taxes, how will the journal entry PKE uses to correct the error effect retained earnings? Note: please use a negative sign if the adjustment reduces retained earnings.