A B737 CREW REPORTS A FLAP ASYMMETRY WITH FLAPS AT 5DEGS. THIS AIRCRAFT HAD THE SAME PROBLEM EARLIER IN THE DAY. AN EMERGENCY WAS DECLARED FOLLOWED BY A NORMAL LANDING.

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ON A 10 MI FINAL TO RWY 27 ZZZ; THE FLAPS WERE LOWERED TO 10 DEGS; THE FLAPS STOPPED AT 5 DEGS. I WAS FLYING THE PLANE AND THE CAPT RAN ALL THE CHKLISTS WITH A JUMPSEATER BACKING HIM UP. THE CHKLIST PROC DID NOT FIX THE FLAP PROB. THEN; PER THE CHKLIST; THE CAPT CALCULATED SPDS AND LNDG DISTANCE AND ALL WAS GOOD TO GO FOR RWY 27. I FLEW ATC VECTORS DURING THIS TIME AND WE DECLARED AN EMER AND PASSED ON ALL APPROPRIATE INFO TO ATC AND DISPATCH. I THEN DID MY OWN NUMBERS TO MAKE SURE THE CAPT AND I CAME UP WITH THE SAME NUMBERS; WE DID. THE CAPT BRIEFED THE CABIN CREW BUT DID NOT PREP THE CABIN. THE PLANE WAS LANDED WITH FLAPS 5 DEGS AND SLATS AT 'EXTEND.' THE LNDG WAS UNEVENTFUL. AFTER CLRING RWY 27 THE FIRE DEPT CHKED FOR HOT BRAKES. BRAKES WERE GOOD AND WE TAXIED THE PLANE TO GATE AND DEPLANED NORMALLY. THERE WERE NO HUMAN FACTORS. ALL ACR PROCS AND CHKLISTS WERE FOLLOWED. SUPPLEMENTAL INFO FROM ACN 813945: THIS MALFUNCTION HAPPENED TO THE SAME AIRPLANE THIS MORNING AT ZZZ1. I RECEIVED THE PLANE FROM THE PLTS AT ZZZ2 THAT HAD FLOWN IT FROM ZZZ1-ZZZ2-ZZZ1 EARLIER. THEY CYCLED THE CIRCUIT BREAKERS; AS WE DID; BUT GOT CTL OF THE FLAPS AND LANDED NORMALLY. THE FLAPS WORKED NORMALLY ON THEIR RETURN LEG FROM ZZZ2 TO ZZZ1. I THOUGHT IT WAS JUST A 1 TIME EVENT; AS HAPPENS WITH OLD AIRPLANES.