The Titanic Historical Society Inc which donated a 28foot 1ton replica to the Marine Museum 25 years ago recently sought assurance that its famous model would not sink into oblivion Questions over the ships status society members said were prompted by a series of Herald News stories including one on Oct 27 reporting that the Internal Revenue Service revoked the Marine Museums nonprofit standing this year as a result of its failure to file IRS 990 forms for at least three years