Capacitor 15000uF 35V.

£3.50

15,000 microfarad, 35 volt capacitor with snap-in leads.  Used primarily in WPC Power Driver boards. Replaces capacitors in positions C5, C6, C7, C11, and C30 which are common culprits in game reset issues.

This is the upgraded 35v version of this capacitor   Originally they were 25v but they were prone to failure.
 
Williams/Bally reference #5040-12313-00

Requires above average soldering skills to install. Only replace if you have good reason. i.e. capacitor is swollen or burst.