OT? Apple Stylewriter problems (longish)

All, I'm having and creating trouble with my Stylewriter 1. Problem appeared about a month ago. One row of pixels consistently failed to print. This happened on multiple ink-jet cartridges and after attempting to clean the cartridge (by soaking in 95% propan-2-ol, or isopropyl as the label says). So I opened the thing up, breaking only a few minor plastic latch pieces on the way (and hey, I glued them back - good as new! :-) ). I ohmed out the flex cable from the circuit board up to the print head. The left 25 pads on the circuit board end of the cable conduct with no more than a few ohms up to the 25 contacts where the print cartridge attaches. So I reassembled enough to let it print while I could still see the flex cable. Still missing a row of pixels. The left 2 of the wide traces and the right 2 of the wide traces connect to pins on the flex-cable connector which show about 3V rms while printing and zero while not printing. 3V rms means that's about what my analog Volt-Ohm-meter needle showed while printing a solid black block. But I could not get to the middle 4 connectors because the ribbon cable was in the way. So I took out the circuit board, flipped it over, reconnected all the cables (right way around? I thought so ....) and tried to print again. The printer powered up, but as it tried to print the first time, the power supply (wall-wart) quit working. This was also around the time my VM probe slipped off one of the pins on the row of transistors I was trying to check :-(. Did I short something bad, or mis-connect the ribbon cables and do something equally bad? The power supply (wall-wart) now puts out about 0.2 V (again on my analog VM), vs. the 10 or 11 it used to do. So, questions: 1) Is my (original) problem likely to be one of those transistors? There's a row of 9 of them, right next to the flex-cable connector, with big fat traces leading to doubled pins on the connector and thence to nice wide traces on the flex cable. They are labelled B1243 (I think). 2) What's a less destructive way of telling which one? - Or is it better to just replace all of them? 3) How, short of a large hammer, do I get the power supply opened up? 4) What am I likely to find toasted in there? More details available on request. I'm in digest mode, so it'll be a one-day cycle unless you email me directly (mtapley(a)swri.edu), and still probably a day because I'll read email at work and the busted machine is at home. Apologies if this is not on-topic. Thanks in advance for any help or pointers. - Mark