As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - CABIN RATE WENT FROM 500 FPM TO 3000 FPM WHILE CLIMBING THRU 13,000 SELECTED MANUAL INCR RATE WENT TO 3000 FPM DOWN FOR A FEW SECONDS THEN BACK TO 3000 FPM CLIMB KEPT OSCILLATING UP AND DOWN THEN WENT BACK TO AUTO AND SYSTEM STABILIZED. RETURNED TO BOI FOR MTX. REMOVED AND REPLACED CARGO DOOR SEAL IAW AMM 52-31-26-001-400-801. NO FURTHER DEFECTS NOTED CHECKS GOOD. RETURNED TO SERVICE.