B737-300
Flight Crew Last 90 Days 231; Flight Crew Type 231
Communication Breakdown; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Human Factors; Logbook Entry
Our originating flight was delayed over four hours out of ZZZ. Company Maintenance was working the problem of a fuel leak on the Number 2 (Right) Engine. Company Maintenance signed-off the leak as 'within limits' on the [Log] page prior to the Contract Maintenance write-up stating that the leak was out of limits. We questioned the Mechanic about the seemingly backwards write-up; and were told that it was satisfactory. Upon arriving at ZZZ1; the engine was still leaking and Maintenance informed us that the write-up was not satisfactory and the aircraft was taken out of service. [Recommend to] double check with Maintenance Control if you have questions. Improper Mechanic Logbook sign-off.
Arrived at gate in ZZZ and found aircraft undergoing maintenance by two Company Maintenance persons. The aircraft had a fuel leak. Four plus hours later; Company Maintenance signed-off the aircraft: the fuel leak was within limits and aircraft returned to service. Aircraft Logbook was filled out and flight from ZZZ to ZZZ1 boarded. Upon inspection of Aircraft Logbook; Company Maintenance [had] returned the aircraft to service with a 'within limits' fuel leak on the previous page that had the original write-up. The original write-up of the fuel leak (with Contract Maintenance in ZZZ) stated that the fuel leak was 'not within limits'.Spoke with our Company Maintenance persons in ZZZ about the Logbook clearing on the page before the original Logbook entry. They said their Corrective Action 'clearing entry' overrides the other and that we were good to go. Flew the aircraft to ZZZ1; which is a Maintenance Base for Company. Had Maintenance inspect for any additional fuel leaks and asked them to review the Logbook entries. ZZZ1 Maintenance said the Logbook entries were incorrect and grounded the aircraft. [Recommend] smarter online Maintenance Personnel. Incorrect Maintenance sign-off. Airworthiness [issue].
After arrival; a Captain and First Officer were informed by Company Base Maintenance personnel that Logbook Corrective Action entries at their previous departing station for Number 2 (Right) Engine fuel leaking were incorrect and the B737-300 aircraft had to be grounded.