I replaced the ADC chip on my DSO which was showing abnormal CH(A) traces. Used an Analog Devices AD9288-80 chip which I purchased from Digikey.com.
The old ADC chip was the same as yours; markings were difficult to read, but appeared to be HWD9288BSTZ-40.
Attached, are screenshots of BEFORE and AFTER ADC chip upgrade with WC5.1 and FPGA V1.1 installed. Screenshots for “full speed oversampling” and “normal buffer” modes.