As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTIFIED BY DISPATCH CREW ELECTED TO DIVERT TO LGA DISC-DURING CLIMB AT APPROX 15,000 STANDBY AIRSPEED STARTED TOWARD 0' BY 20,000 STANDBY AI SHOWED 0 AND STANDBY ALTIMETER WAS APROX 6,000 FT LOW. REMOVED AND REPLACED STANDBY AIRSPEED INDICATOR AND STANDBY ALTIMETER. STANDBY AIRSPEED IND P/N OFF 64050-663-1 S/N OFF 5173. LEAK AND OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.