I am facing problem with sup720-3bxl in 7613 chassis
it shows disabled state and all led shows amber
attaching sh redundancy and dir all for reference
There is something to be checked here now. As you mentioned your standby sup is showing COLD that means it is running in RPR mode and not SSO mode.
The only reason it will run RPR mode is when the 2 sups are not running the exact same image. I believe your standby sup is booted with different image then what you have on active sup.
In 6500 when you are running 2 sups the status of standby module will be displayed as
RPR - 'Show module' will show 'Cold'
RPR+ - 'Show module' will show 'Warm'
SSO - 'Show module' will show 'Hot'
So can you paste the output of "sh mod" and "sh boot" from your active sup?