By 1978 "Queen Elizabeth 2" was breaking even with an occupancy of 65%, generating revenues of greater than 30 million per year against which had to be deducted an annual fuel cost of £5 million and a monthly crew cost of £225,000. With it costing £80,000 a day for her to sit idle in port, her owners made every attempt to keep her at sea and full of passengers. As a result, as much maintenance as possible was undertaken while at sea. However, she needed all three of her boilers to be in service if she was to maintain her transatlantic schedule. With limited ability to maintain her boilers, reliability was becoming a serious issue.