I can't find what indicate line "fan-tray 1 mode: restricted-power" in show env output.
c6509-2#show environment status
operating clock count: 2
operating VTT count: 3
fan-tray 1 type: WS-C6509-E-FAN
fan-tray 1 mode: restricted-power
fan-tray 1 fan-fail: failed
Maybe it means low fans rotation speed, but at the same time I have minor temperature alarm (in this case a fans speed must be fasterst).
"restricted" power is the default for the 6509-E chassis. In fact, the WS-C6509-E-FAN has two modes, Restricted-Power mode( aka Fan2 equivalent mode) and High Power Mode.
High Power mode is designated for future use, and is currently not implemented. In other words, Restricted-power mode is the 'normal' mode that you should expect to see, and is functionally equivalent to the WS-C6K-9SLOT-FAN2 in a 6509.