Damn, that thing looks brand new!
I have a 1744A scope. Many of the transistors and ICs are in sockets, but you have to look really close to realize that there is a socket there! There's no plastic surround, just single-pin sockets that are soldered into the PC board. A few years ago, my scope developed a power supply fault. Wiggling an IC is all that was required to fix it. Be sure to check for that.
Ed