ITS custom Theme not working after upgrade EHP7

Dear Experts,

We previously created changed the standard theme SL and changed the html templates GENERATOR and GUI_CUA and we also added mime objects for logos and header. It was working fine untill upgrade but after upgrade it is not bringing hte custom theme, instead it is bringing the standard theme.

My page was like below before upgrade:

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Clik here to view.

Now the page looks like below after upgrade:

Image may be NSFW.
Clik here to view.

Below are the parameters maintained in SICF for service:

~TRANSACTION    zva01i

~GENERATEDYNPRO    1

~WEBGUI    1

~COOKIES    0

~NOHEADEROKCODE    1

~THEME    sl

~WEBGUI_THEME    sl

~NO_ITS_HEADER    1

~WEBGUI_SIMPLE_TOOLBAR    34

~WDSKIPSPLASHSCREEN    1

I am new to ITS and I am unsure on what to do. could someone help me resolve this issue.

Thanks,

Naveen