Q: Window 7 Bootcamp missing after Yosemite 10.10.5 Install

Installed Yosemite and now my Windows 7 Bootcamp is missing. I'm using a MacBook Pro (15-inch, early 2011).

Last login: Sat Sep 26 16:47:16 on ttys000

CTVs-MacBook-Pro:~ CTVACCT$ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            275.2 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data                         100.2 GB   disk0s4

/dev/disk2

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk2

   1:                        EFI EFI                     209.7 MB   disk2s1

   2:                  Apple_HFS Time Machine Backups    2.0 TB     disk2s2

CTVs-MacBook-Pro:~ CTVACCT$ diskutil cs list

No CoreStorage logical volume groups found

CTVs-MacBook-Pro:~ CTVACCT$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  537510624      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  537920264    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  539189800  241786328        

  780976128  195796992      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976773120         15        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header

CTVs-MacBook-Pro:~ CTVACCT$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]

Signature: 0xAA55

         Starting       Ending

#: id  cyl  hd sec -  cyl  hd sec [     start -       size]

------------------------------------------------------------------------

1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>

2: AF 1023 254  63 - 1023 254  63 [    409640 -  537510624] HFS+       

3: AB 1023 254  63 - 1023 254  63 [ 537920264 -    1269536] Darwin Boot

4: 0C 1023 254  63 - 1023 254  63 [ 780976128 -  195796992] Win95 FAT32L

CTVs-MacBook-Pro:~ CTVACCT$