Progress report on repairing my 2465B with A5 board leak-damage from 2 of the 4 notorious electrolyic caps. The 4 offending caps were removed with both a fine-tipped solder station and using a soldering tweezers. Also, 3 of the small 0.1uf caps in the vicinity of the leaking electrolytics were also removed. The electrolytics were replaced with tantalum types and the 0.1s with ceramics.
I've attached two photos: 1) the pads and traces, one of which had decayed completely; a couple others were corroded but enough remained for resoldering. After thorough cleaning, the damaged pad and trace were repaired with a small piece of adhesive backed copper foil I found at a local shop, and the new parts replaced. The board was reinstalled and the second photo was taken.
Oh, also the old Dallas NVSRAM was desoldered and read into a file, that file was then written to the new Dallas. I decided to use a low-seat type gold plated machine pinned socket which offers a tight and secure fit without damaging the pins of the new Dallas. (I experimented first with the removed chip by installing it into the not yet soldered socket to see if pins bent, or if the pins stuck in the socket. I was able to seat and to remove it without damaging anything, so I decided the wiper type socket wasn't needed.) The socket was then soldered to the board and the newly written NVSRAM was socketed - again, without difficulty.
All in all - no surprises - all went well. Very happily, the scope started, went through its routines normally and appears to be completely functional. I am one happy guy, and very thankful to all of you for sharing your experiences and making it relatively easy for those of us down here on the learning curve.
Parts list for the repair:
DS1225Y-200+-ND 64Kbit 28EDIP chip (DigiKey part#: DS1225Y-200+-ND)
low-seated gold plated 28 machine-pin socket
C2011, C2965: 33uF 10v tantalum, size 2312, Vishay (DigiKey part#: 718-1075-1-ND)
C2113, C2331: 10uF 35v tantalum, size 2312, Vishay (DigiKey part#: 718-1052-1-ND)
C222, C2520, C2890: 0.1Uf 50v ceramic, size 1260, Kemet (DigiKey part#: 399-1250-1-ND)