[j-nsp] Junos upgrade 7.0R2.7->7.3R2.9 on M5 and a problem with auto negotiation on 12xFE pic

[dmitri at nominet.org.uk]

Hi,

I just tried to upgrade Junos on M5 from 7.0R2.7 to 7.3R2.9 and 
encountered a problem. We have some devices connected to 12xFE pic which 
only can do 10M half-duplex. With any Junos up to 7.0 we hadn't had any 
problems with them and M5 always auto-negotiated half-dulex and 10M. Now, 
after upgrading to 7.3R2.9, phisical links with these devices stay down 
unless I explicitly set the interfaces on M5 to 10M and half-duplex. I 
haven't found anything about it in Release Notes.
Has anyone encountered it? Is it a bug? Below is our hardware 
configuration.

Thanks
Dmitri

show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                50434             M5
Midplane         REV 03   710-002650   HF1461            M5 Backplane
Power Supply A   Rev 04   740-002497   LK23061           AC Power Supply
Power Supply B   Rev 04   740-002497   LK23063           AC Power Supply
Display          REV 04   710-001995   HF1167            M10 Display Board
Routing Engine   REV 06   740-003239   9000006978        RE-2.0
FEB              REV 09   710-002503   HF1641            Internet 
Processor IIv1
FPC 0                                                    FPC
  PIC 1          REV 04   750-004176   AV1687            12x FE, 100 
BASE-TX