Do you make a habit of using Airplane-Pictures.net for your systems information?
Unless there was something wrong with the aircraft other than a lack of fuel, they had the #1 VHF Nav and the #1 DBI. They also had standby airspeed and altitude. They had everything they needed in order to know where they were, where the aerodrome was, and where the ILS was.
No, but your comment is the first definitive statement about what services the crew would still have that I've seen here. Given that the aircraft uses engines 1 & 4 for primary generators, and a (engine driven) hydraulic system for the standby generator, and has an APU, I didn't expect to see much on the battery. There's not much in the public domain to confirm what's left.....