Our B737-700 (winglets not installed) has been experiencing repeat defects. ATA 27 Auto speedbrake does arm during approach when lever put to ARM position, green light iluminates, but upon landing speedbrake does not extend automatically. However, during ground checks per AMM they do extend OK. AACU swapped, auto speedbrake actuator replaced, but no luck. Any tips

Thanks

Auto Speedbrake module? Maybe a bad switchpack? Looks like you might have to ring out a few wires if the ASM is not at fault!

FIM 27-62 task 804 , wiring check was done, found high resistance on auto speedbrake actuator. actuator replaced, defect cleared. note this actuator was recently installed about 1 month ago. quality of repairs, pool parts!
Thanks for your tips

I have changed the same part 3 times before to get a servicable one!!!