What was found
SMOKE AND FUMES DET DURING CLIMB. AS CREW WENT THROUGH PROCEDURES IN THE MANUAL THE FUMES WENT AWAY, THE CREW DETERMINED THAT A DIVERSION OR RTF WASN'T NECESSARY. ON FINAL TO DTW, THE NR 1 ENGINE INDICATED VIBES IN THE YELLOW RANGE, THE CREW PULLED NR 1 ENGINE BACK TO IDLE AND VIBES FELL BACK INTO THE GREEN RANGE. CREW DECLARED AN EMERGENCY AND LANDED FOLLOWING PROPER SINGLE ENGINE PROCEDURES (NR 1 ENGINE DID REMAIN RUNNING AT IDLE). AIRCRAFT LANDED SAFELY AND TAXIED TO GATE UNDER IT'S OWN POWER. MX REMOVED AND REPLACED NR 1 ENGINE OPS CHECK AND LEAK CHECK GOOD.