As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
20 MIN OUT OF DCA THE CREW RECEIVED A SLAT FAIL MSG. THEY DIVERTED TO IAD FOR THE RW LENGTH. AC LANDED, AND TAXIED TO THE GATE SAFE. CLEARED SFECU INHIBITS IAW CRJ 700 AMM. PERFOMED SELF TEST OF SFECU AND OPS TEST OF SLATS AND FLAPS SYSTEM IAW CRJ 700 AMM. TESTS PASSED OPS CHECK GOOD.