[CentOS] grep/sed help

I am rsyncing and remotely doing some work based on a logfile from
a windows box from a centos backup server. I get the output from a
vss snapshot that has a section like this:

* SNAPSHOT ID = {639ef5df-c933-4496-878a-ed57b9d52876} ...
   - Shadow copy Set: {427ac5db-21be-4c53-8ca4-24e7bac86a1d}
   - Original count of shadow copies = 2
   - Original Volume name: \\?\Volume{787bdf7a-ccff-11dd-9866-806e6f6e6963}\ [D:\]
   - Creation Time: 6/10/2009 12:12:08 PM
   - Shadow copy device name: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy11
   - Originating machine: milano.example.local
   - Service machine: milano.example.local
   - Not Exposed
   - Provider id: {b5946137-7b9f-4925-af80-51abd60b20d5}
   - Attributes:  No_Auto_Release Persistent Differential

* SNAPSHOT ID = {fb5996cf-a35b-4110-b83c-45f9c64a75f3} ...
   - Shadow copy Set: {427ac5db-21be-4c53-8ca4-24e7bac86a1d}
   - Original count of shadow copies = 2
   - Original Volume name: \\?\Volume{787bdf7b-ccff-11dd-9866-806e6f6e6963}\ [E:\]
   - Creation Time: 6/10/2009 12:12:08 PM
   - Shadow copy device name: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy12
   - Originating machine: milano.example.local
   - Service machine: milano.example.local
   - Not Exposed
   - Provider id: {b5946137-7b9f-4925-af80-51abd60b20d5}
   - Attributes:  No_Auto_Release Persistent Differential

My current script only uses sed/grep but I never had to deal with this case
where now I need to do something based on the grep'ed/sed extraction of the
value of "SNAPSHOT ID" based on volume name "D:" or "E:"? To make my script
work without rewriting it, is there a sed method to only take the "SNAPSHOT ID"
if the text indented beneath it has "D:", then do the same and extract
"SNAPSHOT ID" if and only if "E:" follows?

Thanks for any help!
jlc