2010 TPMS Diagnostics

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Mazda Protege5
The TPMS light in my 2010 M6 GT started flashing this past week. That usually indicates a bad sensor. I checked the air pressures (all were at 32-33 PSI) and did a TPMS relearn cycle, but that did not resolve the issue. All of the sensors were replaced between Aug and Nov of last year. So, is there any onboard diagnostic capability to indicate what might be bad?
 
Hopefully, the TPMS issue is fixed. Took it to a local tire place for a free TPMS check. It was the RR sensor. Replacement cost $135. Yeah, right. So, I put my spare sensor on the counter and asked how much to install it. $35 - mount, balance, new seals. So I ask "can't you just break the bead, reach in and swap the sensors?" Well, yes. But, they won't guarantee anything. That's all I would have done, so fine by me. So, out the door for $12.
 
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