[Collins] re: newbie question

[wli]

Recently, I picked up a cosmetically clean R-388 Order 25067-PH54-55
Had all the tubes and both covers
Not able to test before purchase at a busy local hamfest (lame excuse)
It was almost deaf on all bands when I tested it initally at home.

I replaced the power cord with a new 3-wire cord and replaced weak/wrong tubes. Both 47µF electrolytics seemed OK (both leak <0.1µA at 250v). Slowly brought it up on a Variac, passed the smoke test. No internal components seemed discoloured or broken. 

Funny thing: B+ at pin5 of C217B was only 50V, whereas it was 240v at pin3 of C217A. Next move could be to break the B+ line at C217B and measure the mA draw...

Does this make sense?
What other things should I do before that?
What are the weak areas to look at in a R-388?

Thanks

W. Li
Mercer Island, WA