0045 7 Oct 67
Contemplated memory problems. Ran logic margins on core 3 Rack D got -3V. But that showed was not missing RDRS.
Tried running DP. Got a few core 3 missing RD RS. Got much oring of DP core 0 & core 2. In the hope of curing this tried checking and resoldering the connectors on [MB or M8?] line [1' or 2' ?] for P0 & P2 in core 2
Found 2 cold soldered joints and 1 likely short between 2 lines. Fixed all. Tried again. No success. Core 0 & core 2 oring still there.
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