As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1422 LGB-PDX - UPON FLAPS DEPLOYMENT, SLATS FAILED TO EXTEND AND RECEIVED SLAT FAIL EICAS MESSAGE. COMPLETED QRH AND SLATS REMAINED AT ZERO THROUGHOUT FIM 27-81-00-810-802A CLEARED INHIBITS C/W TESTS ALL FAULTS CLEARED. OPS TEST OF FLAP/SLAT AMM 27-80-00, ALL CHECKS GOOD. ALSO ACCOMPLISHED SLAT ACTUATOR INSPECTION CHECK OF RIGHT AND LEFT SIDE PER 27-81-01. ALL SLAT ACTUATORS GOOD.