this is Fred from Switzerland
My first thought was that they put another head assy inside with slow reading heads
Did you check this? I had cases were they put damaged or broken heads inside.
Sometimes that date from the HA is not fitting together with yours drives pcb date.
I meant if you have a 2010 produced drive and HA is from 2011
Btw I took one of my WD10TMVW-11ZSMS0 for comparison.
Mine was produced 24th of Sept 2010; USB Board 771737 changed it to 771692.
Both PC-3000 and MRT brought a SPT of 1108.
ROM Version close to yours 000200A compared to yr 0002008A.
If you want to send me yr mods then I could have a look at them.
Maybe we can find out what these "nice" guys did.