What was found
AIR RETURN, CABIN DOOR ALERT 6500 7000, & AFTER LANDING. GROUNDED - YES. PERFORMED FIM 52-70 TASK 805. FWD CABIN DOOR SENSOR INDUCTANCE GOOD. CONFIRMED PROX SENSOR DIMENSION WITHIN LIMITS IN REF TO AMM 52-70-01. PRESSURIZED AIRCRAFT, COULD NOT DUPLICT FAULT.