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A repair with PCC will erase internal data.
To downgrade you have 2 options
1. contact your local Xperia Care
2. use flashtool
1. http://support.sonymobile.com/global-en/contactUs/
2. /t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459 just find the correct FTF file on the XDA forum
as for PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
yes about 1.2GB