Firmware upgrade encountered an issue - help with PIT/BRICK?

Hi
I've got a P5113 running Android Andi's CyanogenMod KitKat.
Today it won't start at all when I press power. Wont go into recovery, but does go into download.

I've tried flashing a new recovery with ODIN (philz_touch_5.03.7-p5113.tar.md5) but it fails.
ODIN recognises the tab, the process starts gets to "NAND Write start" and then the box in the top left goes RED and says FAIL!

The tab now show as screen saying "the firmware upgrade encountered an issue. Please select recovery mode in kies and try again"
That screen now won't go away....when i power the tab off it just comes back on to that screen!

I thought I should maybe try to return to stock and even repartition....maybe something got corrupted.....
But I'm worried as I've read all the warnings about how repartitioning can kill the tab....

maybe the tab is dead already but I guess I've got one chance with a repartition, so I'd like to do it right.
I'm currently downloading a stock firmware from sammobile.....any chance some one can give me any tips or hints to fix my problem?

I think I extract the pit file from the zip and tick repartition.....but would like to build confidence....

Thanks in advance

Kev