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If is impossible to locate the A003, a replacement to consider will be something analogous to my explanation, but using low drift devices: 3x series 33V tuner voltage regulator (like TAA550 or equivalent), plus 2x 5V6 zener, all in series with the optocoupler anode, and optocoupler cathode wired to ground. This will results in a sufficient low drift substitute.
I made some voltage regulator based on these 33V tuner devices with very good results. One just for a TV, with failed regulator, for saving it from dumpster.
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So many projects, so little time...
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