What was found
(CAN) AFTER DEPARTURE, THE CREW NOTICED EXCESSIVE ENGINE VIBRATION. AFTER CONSULTATION WITH MAINTENANCE, IT WAS DECIDED THAT THE FLIGHT SHOULD RETURN. CARRIED OUT NR 1 ENGINE BLADE LUBE IAW EMM 72-00-00-030-806, 72-00-00-030-808 & 72-00-00-030-805, PERFORMED ENGINE VIBRATION CHECK & ADJUSTED WEIGHTS IAW PLOT AT B15, 16 & 17 IAW 72-00-00-700-805, IP VIB AT 1.4.