I did not unsolder any wires. Just gave the dust covers a wash. As well as the other side.
Originally my imbalance issue gradually got worst over one month whether it stem from improper storage or our high humidity in Spore, I don't know . I tried searching for a solution when I stumble onto this block. Most of the postings were about returning to Stax under warranty. Mine was bought as 'used' condition from Amazon. Hence no warranty.
As I had success 'washing' my ML speakers, I thought what the heck... nothing to loose... so give it a try. After 'washing' and drying thorougly, I was amazed at the result. The full glory of my Sr009 sound returned back.
If it is just gentle 'washing' of the dust covers and does not involve the diaphram, then great. Still the process requires delicate work to do the 'washing'. Why it solves the problem for me, the jury is still out I suppose.
Was just sharing my findings. Good to have this community caution me on where the danger areas are. Am grateful to those that replied to me.
What you mention about taking the SR009 on a flight can be another possible reason why some return their SR009 to Stax and the find no fault. Worth investigating.