Technical issues were reported on 9 May
The Isle of Man Steam Packet Company says repairs to one of the Manannan's engines is complete and is now operating to schedule.
Just over a week ago, technical issues arose with the inner main engine on the starboard side.
Trips to and from Liverpool were subsequently extended as a result.
The company has thanked passengers for their patience.
Government plans to withdraw interest from reserve fund no longer required
Higher than expected income tax receipts mean it's not necessary
Peel Commissioners not adding 'discretionary' one percent increase to social housing rents
It reviewed rent arrear levels and 'escalating' food costs when making the decision
New organ donation laws set to come into force in coming weeks
It follows Tynwald approval of new measures earlier this year
CoMin 'recognises and is mindful' of minimum wage concerns
Chief minister discusses businesses' reaction to upcoming rise