Known failure modes for the DEC H7441 Power Supply?

I am continuing to make progress with the power supply modules for the PDP 11/04. The previous week involved testing and replacing a few of the electrolytic caps... a few pictures and some comment (although no great technical insights) at http://www.quicktrip.co.nz/jaqblog. Today I got a chance to test the modules. One of the H7441 +5V supplies works fine (http://www.quicktrip.co.nz/jaqblog/images/BLOG_PDP11_5V_2.jpg) ... the output is a little high at 5.5v but that could be my meter calibration. I haven't played with the adjustment pot yet until I can confirm that my meter is reading correctly. The other +5V supply doesn't run ( http://www.quicktrip.co.nz/jaqblog/images/BLOG_PDP11_5V_1.jpg)... goes up to just over 1v as the AC comes up and then settles back to 0.5v. The DC voltage after the rectifier and across the main input capacitor looks OK on the meter. I have the PDP11/34 technical drawings with the schematic for the H7441 so will work though it but to get a head start, are there any common failure modes for these supplies that I should check first? The H745 -15V (http://www.quicktrip.co.nz/jaqblog/images/BLOG_PDP11_-15V.jpg) supply works fine although the Power OK bulb on the back has failed. I will replace it with an LED + resistor like the H7441. And assuming I sort out the last H7441 are then any recommendations on powering up the backplane? It has the following boards installed plus grant continuity cards as appropriate: M7257 RK05 M7256 RK05 M7255 RK05 M7254 RK05 M7258 Printer M7856 RS232/SLU M7860 General Device Interface M7856 RS232/SLU M7847 Memory M7847 Memory M7859 Console Interface M7263 Processor M9301 Unibus Terminator M7850 Parity Board M9202 Unibus Connector I assume it is good practice to draw a map of all the board locations, then remove them all, power up the backplane and check the power... but what is the next step. My guess is that a minimum set of boards would be the following: M7847 Memory M7847 Memory M7859 Console Interface M7263 Processor M9301 Unibus Terminator M7850 Parity Board Any suggestions? Regards Andrew