Are you replacing the 10uF caps prior to the attenuator, or the ones added in the second upgrade? Typically you'd want to do all four (the caps on the XLR outputs aren't nearly as critical, and I actually use electrolytics there in my personal builds).
On an ODAM, the short lead should be connected to the terminal with the DC voltage present, and the long lead to the terminal that reads 0V (according to the V-H audio website at least).