Wightlink Ferries conducted full safety checks on its other ferries overnight following the incident which affected the St Helen last night.
Engineers inspected and tested the mezzanine decks before returning the ships to service. St Helen remains out of service.
As well as conducting its own investigation, Wightlink says it will be cooperating fully with the Marine Accident Investigation Branch and the Maritime and Coastguard Agency investigations. While those investigations are underway, Wightlink will not be making further comment on the possible cause of the incident.
Wightlink added, "St Helen, in common with all Wightlink ferries, is inspected regularly by external surveyors. The last independent engineering survey of the ship, including its mezzanine decks, took place in May 2014 following her annual maintenance and refit."
No significant disruption is expected as a result of the incident.