Orchid ID plus care recommendations

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Welcome to the Orchid Board!

Oncidiums are epiphytic, meaning they grow on trees. Roots are exposed to air at all times. Some epiphytic orchids have times of dry weather. This kind does not, and the roots should stay moist. Potting in LECA and standing in some water should allow air and moisture to the roots.

It is likely the old medium was rotting, and there was not enough air to the roots. This can kill roots. Oncidiums usually make new roots only around the time of new growths, and only from new growths. Without enough water developing leaves have wrinkles. This can be from not enough roots, or not enough water.

These plants are survivors. It is likely your plant, now repotted, will resume growing and recover. Normal home temperatures are good for them. They like bright light, but don't need direct sun.