A 1K-ohm pull-up on that line would suck an extra 2.5mA of current, so that's a bit close for comfort. But a 2K-ohm pull-up (two 1K in parallel) would draw only half that, and might help to pull the output voltage up high enough for more reliable serial.
Lack of sleep again , Mark...?
Two 1k in parallel would give 0.5k, not 2k. Two 1k in series would give 2k resistance.
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