What was found
ELECTRICAL BURNING SMELL THROUGHOUT AIRCRAFT SMELL DISSIPATED PERFORMED AN INITIAL INSPECTION FOR EVIDENCE OF SMOKE OR BURNING ODOR IN THE FLIGHT COMPARTMENT AND MAIN CABIN IAW AMM 05-51-26-800-801-C1. COMPLETED UP TO STEP C (OPERATIONAL CHECKS OF CABIN SYSTEMS) FOUND RT RECIR FAN BREAKER POPPING, FOUND LEFT AND RIGHT RECIR FAN CHECK VALVE INSTALLED BACKWARDS. REMOVED AND REPLACED RT RECIR FAN OPS AND LEAK CHECK GOOD IAW AMM 21-25-02, REINSTALLED CHECK VALVE FOR CORRECT FLOW OPS AND LEAK CHECK GOOD IAW AMM 21-25-03. REMOVED AND REPLACED LEFT AND RIGHT RECIR FAN FILTER IAW AMM 21-25-01. RAN BOTH PACKS NO BURNING SMELL NOTED.