What was found
SEA - THE LT MLG AFT DOORS WILL ONLY OPEN WHEN EXCESSIVE PULL FORCE IS USED ON THE MLG ALTERNATIVE EXTENSION HANDLE. DURING NUMEROUS PULL TESTS, IT TOOK BETWEEN 80-95 LBS OF FORCE TO OPEN THE LT MLG AFT DOORS. THE PULL FORCE WAS 40-45 LBS TO OPEN THE RT MLG DOORS. FERRIED TO PDX FOR REPAIRS. FOUND LT AND RT AFT DOORS OUT RIG AND BINDING AT CLOSE POSITION, ADJUSTED LT, AND RT MLG DOORS OPS CHECK TEST OF THE LANDING GEAR PRIMARY EXTENSION AND RETRACTION SYSTEM GOOD. PERFORMED OPERATIONAL TEST OF THE ALTERNATE OF THE ALTERNATE EXTENSION SYSTEM OPS CHECK. RETURNED TO SERVICE.