What was found
F/A REPORTED SMOKE IN CABIN DURING CLIMB THROUGH 12,000 FT, ACCOMPLISHED QRH ITEMS, SMOKE SUBSIDED. RETURNED FOR NORMAL LANDING. ACFT GROUNDED. DIVERSION TIME 7 MINUTES. COMPLETED CONDITIONAL INSP, REF MM 05-51-56-200-801 & 21-00-01-101. NO LEAKING FLUIDS OR ELECTRICAL SMELLS OR BURNS NOTED. OPERATED BOTH PACKS AND BOTH RECIRC FANS WITH APU BLEED AIR. NO SMOKE OR ODORS NOTED IN CABIN OR COCKPIT. RESEARCHED ACFT HISTORY & NOTED NR 2 ENGINE FAN LUBE PERFORMED. COMPLETED ENG RUN & SLIGHT ODOR ON NR 2 ENGINE PERSISTED. DID HIGH POWER RUN OF BOTH ENGS AND FUMES WENT AWAY. REPLACED BOTH HEPA FILTERS LT & RT REF MM 21-21-23. OPS NORMAL.