As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ERRATIC AIRSPEED AND ALTIMETER INDICATIONS ON THE F/O PFD ALONG WITH ASSOCIATED AIR SPEED AND ALTMETER ALERTS ON THE PFD IN STORMY WX AT FL370. THE CREW DESCENDED TO FL270 AND THE AIR SPEED AND ALTIMETER INDICATIONS WENT TO NORMAL AFTER 10 TO 15 MINUTES. MX INSPECTED AND REPLACED THE PITOT FLEX LINES AT THE AIR DATA COMPUTER 1 & 2. OPS CHECKS WERE GOOD.