What possessed somebody to "ty-rap" the electrolytic filter caps together?
I'd say the Ty-Raps might be added to reduce side-to-side movement due to vibration during transport.
If you've ever watched a printed circuit board with unsupported components, whilst the unit's bolted to a high power vibration table in an environmental test lab and illuminated with a synchronised strobe, you'll have seen tall capacitors "waving in the breeze".
I had to totally redesign a commercial PCB because all the capacitors and power transistors vibrated loose and broke off, when subjected to prolonged operation inside a vehicle installation.
Personally, I would have clamped those electrolytics properly if I had any concerns about vibration.