What was found
AIR TURN BACK DUE TO FUMES AND SMOKE IN CABIN. ACCOMPLISHED VISUAL INSPECTION OF COCKPIT, CABIN AND E AND E COMPARTMENTS, NO DEECTS NOTED. ACCOMPLISHED VISUAL CHECK OF LT AND RT ENGINES AND APU, NO DEFECTS NOTED. ACCOMPLISHED FIM 71-08, TREE 814 UP TO STEP D. NO DEFECTS NOTED. RAN ENGINES AND APU WITH RT PACK OFF, NO DEFECTS NOTED. TROUBLESHOOTING FOUND RT ACM FROZEN AND INOPERATIVE, AIR CONDITIONING PACKS. REMOVED & INSTALLED RT ACM IAW AMM 21-51-03, OPS CHECK GOOD, NO ODOR IN CABIN.