What was found
DURING CLIMBOUT AT FL 710 F/A REPORTED ACRID FUMES IN AFT CABIN. AIRCRAFT RETURNED TO DEPARTURE. MAINTENANCE CHECKED RECIRCULATING EQUIPMENT, IFE AND CARGO COMPARTMENTS. NO FUEL OR HYD LEAKS, DRAIN MASTS OK. INSPECTED ALL CABIN LIGHTS, SEAT ENTERTAINMENT AND POWER OUTLETS. CHECKED EMERGENCY LIGHTS AND POWER, NO FAULTS FOUND. RAN BOTH ENGINES AND PACKS CHECKED COFFEEMAKERS AND OVENS. NO PROBLEMS FOUND ACFT RETURNED TO SERVICE.