[Amps] Transformer reliability? 34yr old Collins...

[TMorton]

A local ham has a power transformer and I am considering using it to 
power a 8877. I sent the serial numbers to the manufacturer, Johnson 
Electric Coil Co and they answered that the xfmr was made in 1976 for 
Collins Radio. My question is how reliable would this be after 32years? 
What are the pros/cons?
Thanks for any suggestions/advice.
73
Tom
CX7TT