As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - THE CABIN HEAT WAS TURNED UP ON DESCENT INTO BOI AND FLIGHT CREW NOTICED CONSIDERABLE SMOKE IN THE CABIN. BLEED AIR WAS SWITCHED OFF AND AIRCRAFT LANDED IN BOI WITHOUT FURTHER PROBLEMS. MAINTENANCE CONFIRMED THE SMOKE FROM NR TWO BLEED AIR SYSTEM. NR TWO BLEED AIR PLACED ON MEL 21-4.