There is an "X" handwritten behind the part number. There is a tag attached to the object which reads, "DEFECTIVE MODULE, User 11, PDP No. 4, Ser. No. IN PERIPHERAL CHECKOUT, Removed by [ILLEGIBLE], Describe Fault PIN Y IS AN INPUT BUT SITS AT -1.5 VOLTS AND MAKE [sic] A ZERO LOOK LIKE A ONE, DIGITAL EQUIPMENT CORPORATION -:- MAYNARD, MASS.." The back of the tag reads, "Repaired by TESTED 418, Date 9-16-68, Describe Repairs RETESTED OK."