What was found
(B-18708) SHORT AFT REACHING TOC, OIL QTY DROPPED TO 1, OIL TEMP RISING VERY SLOW, OIL PRESS DROPPED SLOWLY. BOTH STABILIZED BEFORE REACHING LIMIT, THR LEVER WAS RESTARED, NO MESSAGE APPEARED. GROUND CHECK FOUND OIL LUB & SCAV PUMP TGB & AGB INLET SCREEN WERE BLOCKED BY UNKNOWN FIBER. BSI A-SUMP AND CLEANED TGB & AGB INLET SCREEN. ENG RUN UP TEST NORMAL AND THEN ACFT RELEASED. DURING PUSH-BACK, ENG 1 OIL DROPPED TO 1 AGAIN AND FIBER WAS FOUND AGAIN AT TGB & AGB INLET SCREE. ENGINE WAS REMOVED AND WILL BE DISASSEMBLIED FOR FURTHER INVESTIGATION.