Amiga 2000 - yellow screen on boot, ticking from floppy

[Castellen]

Yes - the Buster 5731 IC normally runs cold by comparison.

It's not that common for IC faults to cause the symptoms you're describing, but it can happen in rare cases, e.g. broken bond wire termination.

Are all of the IC sockets on the board brand new?  That would be my first suspicion.  All of the IC leads should be carefully cleaned as it's common for dirt/oxides to cause intermittent contact issues in the sockets.  Clean the leads using a fibreglass brush then isopropyl alcohol.

I can't comment on the solder joints without seeing it.  Though it'll be a plated through hole board, which is by far the easiest to hand solder correctly.
 

[Castellen]

It almost sounds like he has a lot of desoldered chips in sockets which may or may not be new.. lots of contact problems or bad chips from damage.
If using old chips pulled,it may of been better to solder them back in without sockets to avoid connection problems.

100% agree, IC sockets are great if you love horrible intermittent problems and unreliability.  If you really want to fit things in sockets, at least use decent machine pin sockets (the ones with round holes), or use new parts.  Hopefully you're only socketing the Commodore ICs, ROM, CPU.  With none of the logic gates, etc, in sockets - which is just asking for trouble, especially if using second hand corroded ICs.