As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING ASA T/C 78273000 FAULT CODE APPEARED ON #1 ENGINE. FAULT CODE 73- 30791 PS3 SIGNALS DISAGREE SHORT TERM FAULT. MUST BE CORRECTED IN 50 FLIGHT HOURS. GROUNDED - YES. ACCOMPLISHED B737-800 FIM TASK 73-26, 806 STEP B(2). CLEARED PS3 LINE OF MOISTURE AND VERIFIED NO OBSTRUCTION OF WEEP HOLE. FAULT NO LONGER PRESENT. COMPLETED REPAIR CONFIRMATION, EEC TEST, TEST PASSED, NO FAULTS FOUND.