What got me interested in this was seeing the P/K PPS ratio trading opposite with what had happened with CIT. I originally thought something weird was going on, but it now makes sense after seeing the "Fundamental change" provision. With CIT, the preferreds with the optional conversion traded higher than the non-convertible preferreds before and during BK. With WAMU, it looks like the market is spooked over this provision.
To go further, it looks like the WAMU prospectus is horribly written, especially the fundamental change section. Who has the option to convert? Is it mandatory? What happens to the shares if the shares are not converted?