@frankie75: probably both are ok. The no-load voltage voltage is indeed a bit high (especially the 30.2VAC one you measured), but keep in mind that multimeters also vary in terms of accuracy. I’ve tested both Hunter and Rainbird transformers (which are probably the same model as you have), and they both work fine.
I’m pretty comfortable with multi-meters….. I’m an hardware engineer at National Instruments…… I used a 6.5 digit one from my lab.
Where can I find the schematic of the Ospi board