As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OUT OF 32,000 FT, OBSERVED STANDBY AIRSPEED INDICATOR SHOWING 450 KTS (CAPT & FO A/S = 260 KTS). AS WE DESCENDED BACK TO SLC, STANDBY AIRSPEED INDICATOR CAME DOWN WITH ALTITUDE (ACTED LIKE ALTIMETER). REMOVED AND REPLACED STANDBY DRAIN ASSY IAW 34-11-00. OPS & LEAK CHECKS GOOD.