What was found
AFTER TAKE OFF F/A CALLED COCKPIT REPORTING STRONG ELECTRIC BURNING FUMES IN CABIN. SOME ODOR IN COCKPIT. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO FIELD ORD WITHOUT FURTHER INCIDENT. MAINTENANCE, WHILE TROUBLESHOOTING, FOUND A WIRE SPLICE CONTACTING DUCT BELOW LT ACM. REPLACED CONNECTOR IAW SWP MM 20-31-01. MAINTENANCE CONTINUED TROUBLESHOOTING AND REPLACED THE LT PRSOV IAW MM 21-31-01-2, OPS AND LEAK CHECKS OK. AS A PRECAUTION, ALSO REPLACED BOTH LEFT AND RIGHT PACK COALESCER BAGS IAW AMM 21-20-02, AND CABIN AIR RECIRCULATION FAN FILTER IAW AMM 21-20-18, ALL OPS AND LEAK CHECKS OK. THE AIRCRAFT WAS GROUNDED. (SEE ALSO SDR AALA20170414009)