When you drain the oil from a turbofan, you can see two wires coming out of the drain-hole after you removed the drainplug. These wires are there for other purposes installed by the turbofan manufacturer (bearing temperature thermocouple measurements used in the shop) and are not used when installed in the 737. It looks very strange but no worries just put them back into the hole carefully and install the plug. There is a note about it in the AMM 21-52-61 page 301 ff. See picture below:
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