As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- CLIMBING THROUGH 5000 FEET RECEIVED A GLD UNSAFE CAUTION MESSAGE AND FO'S RADIO ALTIMETER WAS SHOWING ZERO FEET WITH A BARBER POLE. C/W CHECKLIST AND ALL RETURNED TO NORMAL. MAINTENANCE C/W RADIO ALTIMETER OPERATIONAL CHECK AND GROUND SPOILERS OPERATIONAL CHECKS WITH NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.