DEC PC04 Paper Tape Reader/Punch

Hi, All, I've got a DEC PC04 punched tape reader/punch that I've been working on getting running on my PDP 8/e. The punch seems to work well. The reader, on the other hand, has a problem. The 2^2 bit is always stuck low. So, I started tracing things down, and found that the phototransistor in the read head at that bit position is 'dead'. Problem is, the reader uses an array of 10 phototransistors, (8 for data holes, one for sprocket hole detection, and the last for detecting an "out of tape" condition) arranged in a linear array with 0.10 spacing, with built in lens bubbles. There's no way to substitute just the one failed phototransistor. I can't find anyone online that has anything similar to this array avaialble. I'm hoping someone out there has experienced a similar situation, and may have some ideas as to how I can get the reader working 100% again. I want to run all of the MAINDEC diagnostic tapes on the CPU, but it's tough without the reader. Thanks, Rick Bensene The Old Calculator Web Museum http://oldcalculatormuseum.com