Oncidium Sharry Baby with soft yellow pseudobulb

[mexicowpants]

Hi, had this Oncidium Sharry Baby for a few months now and it's been growing like no-one's business. Just noticed yesterday that the oldest pseudobulb has turned yellow, is a bit softer than I would consider healthy, and is a darker brown colour toward the base (this pseudobulb is usually occurs from view by the rest of the plant, hence my only just noticing it).

Should I be worried? Does it need removing? Would it be advisable to remove the afflicted pseudobulb and repot?

I don't have much experience with Oncidium, so any input would be much appreciated.

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