040-332
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Modification kit 040-332 is for the 5T1 timing plug-in for the 661.
Regarding the 040-332 kit, the 5T1 says:
External Trigger Isolation S/N's 494 and up:
The External Trigger Isolation transistor, Q4, isolates the external input from the Trigger circuit so that large pulses generated by the tunnel diodes will not be transmitted out through the EXTERNAL TRIGGER INPUT connector. Instruments with serial numbers 101 through 493 can be modified with kit #040-332 to provide this isolation feature.