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.
Lessons learned after snow day confusion
Minister says steps to be taken to improve communication through staff bulletins
More than 100 firearms surrendered
Police amnesty to end on 2 February
Planning application to extend TT hospitality tent for new Food and Drink Festival submitted
Currently it must be down no more than 10 days after the Festival of Motorcycling
'No tangible positives' achieved by public sector integrity line, says trade union
Unite head says anonymity means nothing when the line is operated by government
