ANCHORAGE -

An Alaska state ferry out of service since last fall for an overhaul of its engines had its return voyage interrupted by oil pump issue.

The Ketchikan Daily News reports the ferry Columbia was to have returned to service this week.

But the ferry remains sidelined in Bellingham, Washington, waiting for a replacement for an engine oil pump to be shipped from Finland.

The Alaska Department of Transportation now expects the 418-foot ferry to be back in service in Ketchikan next Wednesday.

The ship has been at the Vigor Marine Yard in Portland, Oregon, since September, undergoing a nearly $30 million engine replacement project. The ship departed Portland last weekend en route to Ketchikan. However, on Tuesday, the oil pump issue surfaced.