What was found
AFTER TAKEOFF DURING CLIMB THE FOLLOWING LIGHTS ILLUMINATED; AMBER TE FLAP DISAGREE EICAS AMBER TRAILING EDGE DISCREET LIGHT PERFORMED NON-NORMAL PROCEDURE FOR TE FLAP DISAGREE AND LANDED BACK IN KILN WITH FLAPS 20 THE LIGHTS BEGAN ILLUMINATING WHILE FLAPS RETRACTING FROM 1 TO UP. AIRCRAFT WAS GROUNDED BY MAINTENANCE. TROUBLESHOT FLAP SYSTEM IAW B767 FIM 27-51 FAULT TREE 839 AND TREE 809. FOUND FLAP POSITION TRANSMITTERS #1 AND #8 FAULTY. REMOVED POSITION #1 AND #8 TRANSMITTERS IAW B767 AMM 27-51-45. OPERATIONAL CHECK SATISFACTORY. AICRAFT RETURNED TO SERVICE.