The transducer and its cable harness were replaced and tested .
The mission was again postponed when , during prelaunch external tank loading , a transducer on high - pressure oxidizer turbopump for main engine number three showed readings out of specification .
The transducer and transducer 's cable harness were replaced and tested .
The mission was again postponed when , during prelaunch external tank loading , a transducer on high - pressure oxidizer turbopump for main engine number three showed readings out of specification .