Swann DVR6-8000, Help With Faulty Component Identification

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Hi Guy's,

Sorry to join the forum with a question,

I have a Swann Hybrid SDI/Analog DVR6-8000 which has been working as well as can be expected, but is now suffering intermittent boot up problems

The system boots with the loading screen, goes blank then hangs with power & HDD lights on. When running normally the HDD light will go off accompanied by click following the boot screen.

I've opened up the box and found a leaking or burned component next to the 2032 battery and appears to have S251 printed on it can anyone tell me what it is and its value.

Many Thanks

Steve

PS Motherboard is TCMBO2 V110