What was found
DURING CRUISE AT FL370, THE L/E SLAT ASYM MESSAGE ILLUMINATED ON EICAS FOR ABOUT 10 SEC, THEN EXTINUISHED. BOTH FLAP/SLAT INDICATOR NEEDLES MOVED FROM TO SLIGHTLY ABOVE THE UP MARK, THEN RETURNED TO UP. NO VIBRATIONS OR CONTROL ISUES, FLAP HANDLE REMAINED UP AT 0. ACCOMPLISHED OPS CHECK OF FLAP/SLAT SYS, NO FAULTS. ACCOMPLISHED FIM 27-51 AND PSEU BITE, NO FAULTS, TEST 40 ACCOMPLISHED AS WELL, NO TROUBLE FOUND, OK TO CONTINUE SERVICE.