What was found
AFTER SHUTDOWN, WITH APU ON AND SET TO AUTO-NORM, CABIN FILLED WITH SMOKE. NO COCKPIT INDICATIONS AND PACKS STILL BLOWING COOL AIR. PER CONVERSATION WITH THE CAPTAIN, SMOKE WAS NOTICED ON LANDING ROLL. WHILE INVESTIGATING CAUSE, RIGHT GROUND COOLING FAN SHUT DOWN AND THEN RESTARTED AFTER TEN TO FIFTEEN SECONDS. SUSPECT GROUND COOLING FAN ON RIGHT SIDE INTERMITTENT. INSTALLED SERVICEABLE UNIT. OPS CHECK GOOD ON DECK. SN ON 179 SN OFF 164.