From the previously cited article:
“Even though Marine maintainers had rapid, ready access to spare parts from shore and the benefit of the expertise of embarked contractor personnel, aircraft reliability was poor enough that it was difficult for the Marines to keep more than two to three of the six embarked jets in an flyable status on any given day,” reads the DOT&E memo. “The challenges will be substantially tougher when the aircraft first deploys operationally, where working mission systems will not be optional, and where maintenance is likely to be more challenging due to the presence of the rest of the ACE.”