As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6187 - IAD-SCE - DURING CLIMB, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO BETA HORN WARNING SOUNDED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEANED AND ADJUSTED RIGHT POWER LEVERS FOR RT BETA MICROSWITCH, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)