Yep, SRV records do not work in BIND - at least in version 1.3.0.
The relevant code parts in the BIND-Provider simply misses the "if RecordType == DnsRecordType.SRV"
Also probably SRV records get deleted if you add them via the file and later edit the zone in SolidCP.
Lets see when I get my Contributor login - I should be able to fix this - it does not look very difficult ...