This morning, I laced up the 156" and 121" D1002522 extension cables which switch back through the R0 top mass, UIM, and PUM. This involved rebuilding the 5 cable harness brackets in these stages in order to add the fluorel shim stacks. I dropped 8 nuts in the process and had to remove completely 2 of the brackets for further adjustment of binding. Cross your fingers we do not need to take these apart when the suspension is built with glass. Once at the top, I strain relieved these 2 cables loosely to the Upper structure. There are appropriate brackets which I will attach and lace tomorrow. After this work, I verified that the chain alignment was not too far out via the 50% OLVs of the Top Mass. So far so good. After lunch, I attached the 12" UIM D1002523 and 17" UIM D1002524 quadra-puss cables to the extension cables setting them such that they do not short the isolation of any suspension stages (like I did with the extension cables). However, when I went to plug the microD-9pin connectors into the BOSEMs on the UIM (a BEAR due to lack of room to maneuver for attachment) and the AOSEMs on the PUM, we ran into immediate troubles understanding the signals. One set had bean reading some random signals prior to plugging anything in - pointing to rack problems much further away. The other set showed 1 OSEM connection, but was stale when I blocked the light on that OSEM. Long story short, looks like we could use some EE help first thing tomorrow if possible. Robert noted a few other fishy things in the rack. I left the suspension hanging free* but not covered, in the event Kissel wants to run TFs in the morning to at least tell us how the added cables and bracket affect the overall chain. I also left the 2 top UIM BOSEMs perched near their mounting brackets, plugged in, and not touching anything critical (other stages or wires, etc). I did this because remounting them is very difficult and they need stay off until we sort out the signal issues. *as far as I could tell without TFs. Pictures to be posted soon.