As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6329 - BOS-PWM - DURING TAXI, AIRCRAFT RETURNED TO GATE DUE TO NR 2 HSI AND GLIDESLOPE RED FLAGS ILLUMINATED. MAINTENANCE INSPECTED AND REMOVED AND REPLACED NAV RT, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)