If you've tried as different player sounds like it's the PJ. Are you connecting direct to PJ or via amp. You say it's on a trolley ? Might you have yanked the cables at the PJ end and damaged something internally ?
Either way it looks like a Sony jobby. They've closed down there Heathrow Service Centre so not sure where they service the PJ's now ? Give them a call and find out...oh and be prepared, it's usually a sit down job to get your breath back when Sony quote on a repair

...that's if they decide to do it which cannot be a given with them

BOL !