As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FINAL WHEN EXTENDING FLAPS 20 TO 30 FLAPS STOPPED MOVING AT 25 AND LEADING EDGE SLAT ASYM EICAS AND LEADING EDGE ANNUNCIATOR ILLUMINATED. PERFORMED FSEU BITE PROCEEDURE BLOCKS 1, 2, 3 AND 33 OF FIM. NO DEFECTS NOTED. FURTHER TROUBLESHOT TO ISLOLATION OF LEFT WING I/B - O/B SLAT SENCING SWITCH.