What was found
THIS PART, NR 1 FIREWALL SHUT-OFF VALVE PULL SWITCH, HAD AT SOME POINT BEEN DISMOUNTED AND THEN REMOUNTED USING A SCREW THAT WAS LONGER THAN THE REQUIRED NAS387-1032-10. THE REQUIRED SCREW LEAVES ALMOST NO CLEARANCE BETWEEN THE END OF THE SCREW AND THE HOUSING OF A MICROSWITCH IN THE ASSEMBLY. THE LONGER THAN ALLOWED SCREW BROKE THE HOUSING AND THE RESULTING DEBRIS CAUSED THE MICROSWITCH TO ACTUATE ERRATICALLY GIVING FALSE READINGS ON THE ANNUNCIATORS. (X)